#include<bits/stdc++.h> using namespace std; int main(){ char a,b,c,d; cin>>a>>b>>c>>d; if(a=='z'){ cout<<'a'<<" "; } else{ cout<<char(a+1); } if(b=='z'){ cout<<'a'<<" "; } else{ cout<<char(b+1); } if(c=='z'){ cout<<'a'<<" "; } else{ cout<<char(c+1); } if(d=='z'){ cout<<'a'<<" "; } else{ cout<<char(d+1); } }