#include<bits/stdc++.h>
using namespace  std;
int my;
string s1,s2,s3;
int  main( ) 
{
    cin>>s1>>s2>>s3;
    my=abs(s1[1]-s2[1]);
    if (my>26)
        my-=26;
    for (int i=0;i<=s3.size()-1;i++)
    {
        s3[i]+=my;
        if (s3[i]>'Z')
            s3[i]-=26;
    }
    cout<<s3;
    return 0;   
}