create dev channel

zeta/py/completed/1032.py

@@ -0,0 +1,13 @@
+N = int(input())
+K = [input() for i in range(N)]
+shared = K[0]
+
+for k in K:
+    for i, c in enumerate(k):
+        if c == "?":
+            pass
+        elif shared[i] == c:
+            pass
+        else:
+            shared = shared[:i] + "?" + shared[i + 1:]
+print(shared)