diff --git "a/\353\243\250\354\213\234\353\223\234/20221213.py" "b/\353\243\250\354\213\234\353\223\234/20221213.py"
new file mode 100644
index 0000000..6946c28
--- /dev/null
+++ "b/\353\243\250\354\213\234\353\223\234/20221213.py"
@@ -0,0 +1,27 @@
+def postOrder(start, end):
+    mid = (start + end) // 2
+
+    if mid - start > 1:
+        # 재귀 수행
+        postOrder(start, mid - 1)
+        postOrder(mid + 1, end)
+        answer.append(arrs[mid])
+    else:
+        # 출력 수행
+        answer.extend([arrs[start], arrs[end], arrs[mid]])
+        return
+
+
+n = int(input())
+arrs = list(map(int, input().split()))
+answer = []
+changed_value = int(input())
+
+for idx, arr in enumerate(arrs):
+    if arr == -1:
+        arrs[idx] = changed_value
+        break
+
+arrs.sort()
+postOrder(0, n - 1)
+print(*answer)