#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 { cout<<"Input Error!"; } if(a+1>=32&&a+1<=126) { cout<<a+1<<endl; } else { cout<<"Input Error!"; } return 0; }