create dev channel

zeta/py/completed/1764.py

@@ -0,0 +1,14 @@
+noHear = set()
+noSeer = set()
+
+N, M = map(int, input().split())
+
+for i in range(N):
+    noHear.add(input())
+for i in range(M):
+    noSeer.add(input())
+
+new = noHear & noSeer
+print(len(new))
+for name in sorted(new):
+    print(name)