题解 | 密码游戏
num = input()
ans = []
for i in range(len(num)):
x = (int(num[i])+3) % 9
ans.append(x)
def swap(list, i, j):
temp = list[i]
list[i] = list[j]
list[j] = temp
swap(ans,0,2)
swap(ans,1,3)
print(f"{ans[0]}{ans[1]}{ans[2]}{ans[3]}")
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