题解在此

#include <iostream>
#include <algorithm>
using namespace std;
int main(){
    string s;
    cin>>s;
    for (int i=0;i<s.size();i++){
        if (s[i]=='x'||s[i]=='y'||s[i]=='z'||s[i]=='X'||s[i]=='Y'||s[i]=='Z'){
            s[i]-=23;
        }else{
            s[i]+=3;
        }
    }
    reverse(s.begin(),s.end());
    for (int i=0;i<s.size();i++){
        if (s[i]>='A'&&s[i]<='Z'){
            s[i]+=32;
        }else if (s[i]>='a'&&s[i]<='z'){
            s[i]-=32;
        }
    }
    cout<<s;
    return 0;
}