diff --git a/Diagrams.pptx b/Diagrams.pptx
new file mode 100644
index 0000000..430bf92
Binary files /dev/null and b/Diagrams.pptx differ
diff --git a/__init__.py b/__init__.py
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index 0000000..e69de29
diff --git a/bank.py b/bank.py
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index 0000000..8a7f3e5
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+++ b/bank.py
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+lass Bank:
+    __clients = []
+    def __init__(self,name):
+        self.name = name
+    def add_client(self,client):
+        self.__clients.append(client)
+    def authentication(self,name,account_number):
+        self.name = name
+        self.account_number = account_number
+    def getclient(self):
+        self.__clients
diff --git a/client.py b/client.py
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+++ b/client.py
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+import random
+random_list=list(set(random.randint(10000,99999) for i in range(9999)))
+class Client:
+    i = 0
+    def __init__(self, name, total_amount):
+        self.name = name
+        self.total_amount = total_amount
+        self.account_number = random_list[Client.i]
+        self.account={'n':self.name,'ta':self.total_amount,"an":self.account_number}
+        Client.i += 1
+    def withdraw(self,amount):
+        if self.total_amount >= amount:
+            self.total_amount -= amount
+            print(f"The sum of {amount} has been withdraw from your account balance.\
+            Your current account balance is: {self.total_amount}")
+        else:
+            print("\n Insufficient balance ")
+    def deposit(self,amount):
+        self.total_amount = self.total_amount + amount
+        print(f"The sum of {amount} has been added to your account balance.\
+        Your current account balance is: {self.total_amount}")
+    def balance(self,balance):
+        self.total_amount = balance
+        print(f"Your current account balance is: {self.total_amount}")
diff --git a/hackerrank.py b/hackerrank.py
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index 0000000..4fe7c07
--- /dev/null
+++ b/hackerrank.py
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+### sWAP cASE
+s = "Hayat"
+def swap_case(s):   
+    return s.swapcase()
+print(swap_case(s))
+### String Split and Join
+words = "Is it work?"
+def split_and_join(words):
+    x=words.split(" ") 
+    x='-'.join(x)    
+    return x
+print(split_and_join(words))
+### Mutations
+word = "Hello"
+def mutation(word):
+    a = list(word)
+    a[1] = "ö"
+    word = "".join(a)
+    return word
+print(mutation(word))
+### Text Wrap
+x = "I   dontknowthatis  it  work"
+max_width = 4
+def wrap(x, max_width):
+    s=""
+    for i in range(0,len(x),max_width):
+        s=s+x[i:i+max_width]+"\n"
+    return s
+print(wrap(x, max_width))
diff --git a/main.py b/main.py
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index 0000000..9f00a69
--- /dev/null
+++ b/main.py
@@ -0,0 +1,47 @@
+from client import Client
+from bank import Bank
+
+class Main(Bank):
+    bank = Bank(input("Please chosee a name of Bank: "))
+    print(f"Welcome to {bank.name} Bank!\nChoose an option:")
+    while True:
+        menu = input("1. Open new bank account\n2. Open existing account\n3. Exit\nPlease code a number!: ")
+        if menu == "1":
+            print("To create an account, please fill in the information below.")
+            name_c = input("Name: ")
+            deposit_amount = int(input("Deposit amount: "))
+            client = Client(name_c, deposit_amount)
+            bank.add_client(client.account)
+            print(f"Account created successfully! Your account number is: {client.account['an']}")
+        elif menu == "2":
+            while True:
+                print("To access your account, please enter your credentials below.")
+                name = input("Name: ")
+                account_number = int(input("Account Number: "))
+                if name != name and account_number != account_number:
+                    print("Authentication failed!\nReason: account not found.")
+                else:
+                    name == name and account_number == account_number
+                    print(input(f"Authentication successful!\nWelcome {name}\nChoose an option:\n1. Withdraw\n2. Deposit\n3. Balance\n4. Exit\nPlease code a number!: "))
+                    while True:
+                        if input == "1":
+                            withdraw = input("Withdraw amount:")
+                            print(f"The sum of {withdraw} has been withdraw from your account balance.\
+                                Your current account balance is: {total_amont}")
+                        
+                        elif input == "2":
+                            deposit = input("Deposit amount: ")
+                            print(f"The sum of {deposit} has been added to your account balance.\
+                                Your current account balance is: {total_amount}")
+                        
+                        elif input == "3":
+                            print(f"Your current account balance is: {total_amount}")
+
+                        elif input == "4":
+                            print("Exit...")
+                        
+                        else:
+                            print("Enter a correct value from given type help for commands")
+        else:
+            menu == "3"
+            break