#include<iostream> using namespace std; int main(){ char a,b,c,d; cin>>a>>b>>c>>d; a = (a-'a'+1)%26 +'a'; b = (b-'b'+1)%26 +'b'; c = (c-'c'+1)%26 +'c'; d = (d-'d'+1)%26 +'d'; return 0; }