#include<iostream>
#include<string.h>
#include<algorithm>
#include<vector>
#include<math.h>
using namespace std;
int main()
{
    char ch[26]={'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'};
    char s,t;
    int x,y;
    cin>>s>>t;
    for(int i=0;i<26;i++)
    {
        if(ch[i]==s)
            x=i;
    }
    for(int i=0;i<26;i++)
    {
        if(ch[i]==t)
            y=i;
    }
    if(x+y>25)
    {
        cout<<ch[(x+y)/25]<<ch[x+y-(x+y)/25*26];
    }
    else
        cout<<ch[x+y];
	return 0;
}