diff --git "a/week2/10773\354\240\234\353\241\234/solution.py" "b/week2/10773\354\240\234\353\241\234/solution.py"
index e69de29..b8afd95 100644
--- "a/week2/10773\354\240\234\353\241\234/solution.py"
+++ "b/week2/10773\354\240\234\353\241\234/solution.py"
@@ -0,0 +1,11 @@
+k = int(input())
+num_list = []
+
+for i in range(k):
+    n = int(input())
+    if n == 0:
+        num_list.pop()
+    else:
+        num_list.append(n)
+
+print(sum(num_list))
\ No newline at end of file
diff --git "a/week2/1181\353\213\250\354\226\264\354\240\225\353\240\254/solution.py" "b/week2/1181\353\213\250\354\226\264\354\240\225\353\240\254/solution.py"
index e69de29..1eb6107 100644
--- "a/week2/1181\353\213\250\354\226\264\354\240\225\353\240\254/solution.py"
+++ "b/week2/1181\353\213\250\354\226\264\354\240\225\353\240\254/solution.py"
@@ -0,0 +1,9 @@
+n = int(input())
+word_list = []
+for i in range(n):
+    word_list.append(input())
+word_list = list(set(word_list))
+word_list = sorted(word_list)
+word_list = sorted(word_list, key = lambda x: len(x))
+for word in word_list:
+    print(word)
\ No newline at end of file
diff --git "a/week2/17478\354\236\254\352\267\200\355\225\250\354\210\230\352\260\200\353\255\224\352\260\200\354\232\224/solution.py" "b/week2/17478\354\236\254\352\267\200\355\225\250\354\210\230\352\260\200\353\255\224\352\260\200\354\232\224/solution.py"
index e69de29..7b594df 100644
--- "a/week2/17478\354\236\254\352\267\200\355\225\250\354\210\230\352\260\200\353\255\224\352\260\200\354\232\224/solution.py"
+++ "b/week2/17478\354\236\254\352\267\200\355\225\250\354\210\230\352\260\200\353\255\224\352\260\200\354\232\224/solution.py"
@@ -0,0 +1,35 @@
+def chatbot(num):
+    global text1, text2, text3, text4, text5, text6, marks
+
+    if num == 0:
+        print(marks + text1 + '\n' + marks + text5 + '\n' + marks + text6)
+        return
+
+    # print("#### marks:", marks, "####")
+    print(marks + text1 + '\n' + marks + text2
+     + '\n' + marks + text3 + '\n' + marks + text4)
+
+    marks += '____'
+    # print("after plus marks:", marks)
+    
+    chatbot(num - 1)
+    marks = marks[4:]
+    # print("after minus marks:", marks)
+    print(marks + text6)
+
+
+n = int(input())
+
+marks = ''
+
+text1 = '"재귀함수가 뭔가요?"'
+text2 = '"잘 들어보게. 옛날옛날 한 산 꼭대기에 이세상 모든 지식을 통달한 선인이 있었어.'
+text3 = '마을 사람들은 모두 그 선인에게 수많은 질문을 했고, 모두 지혜롭게 대답해 주었지.'
+text4 = '그의 답은 대부분 옳았다고 하네. 그런데 어느 날, 그 선인에게 한 선비가 찾아와서 물었어."'
+
+text5 = '"재귀함수는 자기 자신을 호출하는 함수라네"'
+text6 = '라고 답변하였지.'
+
+
+print('어느 한 컴퓨터공학과 학생이 유명한 교수님을 찾아가 물었다.')
+chatbot(n)
\ No newline at end of file
diff --git "a/week2/1764\353\223\243\353\263\264\354\236\241/solution.py" "b/week2/1764\353\223\243\353\263\264\354\236\241/solution.py"
index e69de29..2163281 100644
--- "a/week2/1764\353\223\243\353\263\264\354\236\241/solution.py"
+++ "b/week2/1764\353\223\243\353\263\264\354\236\241/solution.py"
@@ -0,0 +1,11 @@
+n_list, m_list = [], []
+n, m = map(int, input().split())
+for _ in range(n):
+    n_list.append(input())
+for _ in range(m):
+    m_list.append(input())
+result = list(set(n_list) & set(m_list))
+result.sort()
+print(len(result))
+for person in result:
+    print(person)
diff --git "a/week2/2751\354\210\230\354\240\225\353\240\254\355\225\230\352\270\2602/solution.py" "b/week2/2751\354\210\230\354\240\225\353\240\254\355\225\230\352\270\2602/solution.py"
index e69de29..1de7cf5 100644
--- "a/week2/2751\354\210\230\354\240\225\353\240\254\355\225\230\352\270\2602/solution.py"
+++ "b/week2/2751\354\210\230\354\240\225\353\240\254\355\225\230\352\270\2602/solution.py"
@@ -0,0 +1,19 @@
+import sys
+# import time
+# start_time = time.time()
+# 예제 기준 time: 2.5560574531555176
+
+n = int(sys.stdin.readline())
+
+num_list = []
+
+for _ in range(n):
+    num_list.append(int(sys.stdin.readline()))
+
+num_list.sort()
+
+for num in num_list:
+    print(num)
+
+# end_time = time.time()
+# print("time:", end_time - start_time)