#include<bits/stdc++.h> using namespace std; int main(){ char c; c=cin.get(); if(c<=32){ cout<<"Input Error!"<<endl; } else if(c>=32&&c<=126){ cout<<c-1<<endl; } if(c>=126){ cout<<"Input Error!"<<endl; } else if(c>=32&&c<=126){ cout<<c+1<<endl; } return 0; }