diff --git a/NP/NP28.py b/NP/NP28.py
new file mode 100644
index 0000000..97e1286
--- /dev/null
+++ b/NP/NP28.py
@@ -0,0 +1,21 @@
+#!/usr/bin/env python3
+# @author 轩辕龙儿
+# @date 2022/10/26
+# @file NP28.py
+
+def solution():
+    # num1 = input()
+    # num2 = []
+    # for i in range(len(num1)):
+    #     num2.append((int(num1[i]) + 3) % 9)
+    # num2[0], num2[2] = num2[2], num2[0]
+    # num2[1], num2[3] = num2[3], num2[1]
+    # for i in num2:
+    #     print(i, end="")
+
+    s = input()
+    print("".join(str((int(num) + 3) % 9) for num in (s[2], s[3], s[0], s[1])))
+
+
+if __name__ == "__main__":
+    solution()