题解 | #密码游戏#

num = input()

first = int(num[0])

second = int(num[1])

third = int(num[2])

fourth = int(num[3])

arr = [first,second,third,fourth]

for i in range(len(arr)):

arr[i] = (arr[i] + 3) % 9

arr[0],arr[2] = arr[2],arr[0]

arr[1],arr[3] = arr[3],arr[1]

print(arr[0],arr[1],arr[2],arr[3],sep='')