#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); } return 0; }