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