题解 | 密码游戏
num = input()
# 取出每一位
arr = list()
arr1 = list()
for i in range(4):
arr.append(int(num[i]))
for j in arr:
arr1.append((j+3)%9)
a = arr1[0]
arr1[0] = arr1[2]
arr1[2] = a
b = arr1[1]
arr1[1] = arr1[3]
arr1[3] = b
for g in arr1:
print(g,end = '')