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..dd09f82 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 +1,15 @@
+def main():
+    N = int(input())
+    stack = []
+
+    for i in range(N):
+        n = int(input())
+        if (n==0):
+            stack.pop()
+            continue
+        stack.append(n)
+    
+    print(sum(stack))
+
+if __name__=='__main__':
+    main()
\ 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..e178dce 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 +1,13 @@
+def main():
+    n, m = map(int, input().split())
+    a = set([input() for _ in range(n)])
+    b = set([input() for _ in range(m)])
+    answer = list(a & b)
+    answer.sort()
+
+    print(len(answer))
+    for ans in answer:
+        print(ans)
+
+if __name__=='__main__':
+    main()