#include<bits/stdc++.h> using namespace std; int main(){ char a; cin.get(a); if(a-1>=32 && a-1<=126){ cout<<a-1<<endl; }else if(a-1>=127||a-1<=31){ cout<<"Input Error!"<<endl; } if(a+1>=32 && a+1<=126){ cout<<a+1<<endl; }else if(a+1>=127 || a+1<=32){ cout<<"Input Error!"<<endl; } return 0; }