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