#include<bits/stdc++.h> using namespace std; int main(){ char c; c = getchar(); 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; } }