diff --git a/cevaplar.py b/cevaplar.py
new file mode 100644
index 0000000..f7850e2
--- /dev/null
+++ b/cevaplar.py
@@ -0,0 +1,99 @@
+contacts = {}
+important_contacts = {}
+
+while True:
+    menu=input("important_contacts: 1\ncontacts: 2\nadd: 3\nedit: 4\ndelete: 5\nquit: 6:")
+    print(menu)
+    if menu == "1":
+        for x,z in important_contacts.items():
+            print(x,':',z)
+    elif menu == "2":
+        for x,z in contacts.items():
+            print(x,':',z)
+    elif menu == "3":
+        while True:
+            name = input("enter a name:")
+            print(name)
+            if name.isalpha() == False:
+                print("only with letters")
+                continue
+            else:
+                break
+        while True:
+            if name in contacts.keys():
+                print("There is already someone with this name.")
+                ask = input("would you like to add a number ('y' / 'n')")
+                if ask == 'y':
+                    break
+            number = input("enter a number")
+            print(number)
+            if len(number) != 10:
+                print("only 10 digits")
+                continue
+            else:
+                if name in contacts.keys():
+                    contacts[name].append(number)
+                    important = input("Is this an important contact? (y, n)")
+                    print(important)
+                    if important == "y":
+                        important_contacts[name] = [number]
+                        break
+                    else:
+                        break
+                else:
+                    contacts[name] = [number]
+                    important = input("Is this an important contact? (y/ n)")
+                    print(important)
+                    if important == "y":
+                        important_contacts[name] = [number]
+                        break
+                    else:
+                        break
+    elif menu == "4":
+        while True:
+            edit = input("enter the contact you would like to edit.:")
+            print(edit)
+            if edit not in contacts.keys():
+                print("Contact is not found.")
+            elif edit in contacts.keys():
+                edit_contact = input("edit name or number:")
+                print(edit_contact)
+                if edit_contact == "number":
+                    for i in contacts[edit]:
+                        print(i)
+                    edit_number = input("Which line would you like to change? 1,2,3")
+                    print(edit_number)
+                    if (int(edit_number)>len(contacts[edit])) or (int(edit_number)<1) or (edit_number.isdigit()!=True):
+                        print("It is invalid.")
+                        break
+                    else:
+                        while True:
+                            new_number = input("enter a new number:")
+                            print(new_number)
+                            if len(edit_number) != 10:
+                                print("only with digits")
+                                continue
+                            else:
+                                contacts[edit][int(edit_number) - 1] = new_number
+                                break
+                elif edit_contact == "name":
+                    new_name = input("enter a new name")
+                    print(new_name)
+                    if new_name.isalpha()==False:
+                        print("only with letters")
+                        break
+                    elif new_name in contacts.keys():
+                        print("The name is already in the contacts.")
+                        break
+                    else:
+                        contacts[new_name] = contacts[edit]
+                        del contacts[edit]
+                        break
+    elif menu == "5":
+        delete_name = input("Which contact to delete?")
+        print(delete_name)
+        del(delete_name)
+        del contacts[delete_name]
+        print("Contact is deleted.")                
+    elif menu == "6":
+        break
\ No newline at end of file
diff --git a/hackerrank.py b/hackerrank.py
new file mode 100644
index 0000000..fde6dbe
--- /dev/null
+++ b/hackerrank.py
@@ -0,0 +1,29 @@
+#list comprehension
+if __name__ == '__main__':
+    x = int(input())
+    y = int(input())
+    z = int(input())
+    n = int(input())
+print(list([[i,j,k] for i in range(x + 1) for j in range(y+1) for k in range (z+1)    if i+ j+ k!= n]) )
+
+#tuples
+if __name__ == '__main__':
+    n = int(input())
+    integer_list = map(int, input().split())
+    t = tuple(integer_list)
+    print(hash(t))
+
+#nested list
+if __name__ == '__main__':
+    list_1=[]
+    for _ in range(int(input())):
+        name = input()
+        score = float(input())
+        list_1.append([name,score])
+    a= sorted(list({k for i,k in list_1}))[1]
+    list_2=[]
+    for i,x in list_1:
+        if x==a:
+            list_2.append(i)
+    list_2.sort()
+    print(*[i for i in list_2],sep="\n")
\ No newline at end of file