#include <stdio.h>

int main() {
    char c;
    while (scanf("%c", &c) == 1 && c != '\n') {
        if (c >= 'A' && c <= 'Z') {
            c = 'Z' - (c - 'A');
        }
        printf("%c", c);
    }
    return 0;
}

代码来自：https://yunjinqi.top/article/190