题解

#include<bits/stdc++.h>
using namespace std;
int main(){
string a,b,c;
cin>>a>>b>>c;
int s=((26-(b[0]-a[0])%26))%26;
for(int i=0;i<c.size(); i++){
cout << char((c[i]-'A'+s)%26+'A');
}
}