#include<iostream> #include<cstdio> using namespace std; int main(){ char ch=cin.get(); if(ch-1==31){ cout<<"Input Error!"<<endl; cout<<ch+1; return 0; } else if(ch+1==127){ cout<<ch-1; cout<<"Input Error!"<<endl; return 0; } cout<<ch-1<<endl; cout<<ch+1<<endl; return 0; }