题解

#include<iostream>
using namespace std;
string k,u;
int main(){
    cin>>k>>u;
    for(int i=0;i<u.size();i++){
        char key=k[i%k.size()];
        int move;
        if(key>='A'&&key<='Z')move=key-65;
        else if(key>='a'&&key<='z')move=key-97;
        if(u[i]>='a'&&u[i]<='z'){
            if(u[i]-96>=move)u[i]-=move;
            else u[i]=u[i]+26-move;
        }
        else if(u[i]>='A'&&u[i]<='Z'){
            if(u[i]-64>=move)u[i]-=move;
            else u[i]=u[i]+26-move;
        }
        if(u[i]=='`')u[i]='z';
        if(u[i]=='@')u[i]='Z';
    }
    cout<<u;
    return 0;
}