文件目录

#include <iostream>
#include <algorithm>
using namespace std;
int main()
{
    char mm[200] = {};
    for (int i = 'a'; i <= 'z'; i++)
        mm[i] = i + 3 - 32;
    mm['x'] = 'A';
    mm['y'] = 'B';
    mm['z'] = 'C';
    for (int i = 'A'; i <= 'Z'; i++)
        mm[i] = i + 3 + 32;
    mm['X'] = 'a';
    mm['Y'] = 'b';
    mm['Z'] = 'c';
    string s;
    cin >> s;
    reverse(s.begin(), s.end());
    for (int i = 0; s[i]; i++)
        cout << mm[s[i]];
    return 0;
}