#include<iostream> #include<cstdio> using namespace std; int main(){ char ch; ch=cin.get(); if((ch-1)>=32&&(ch-1)<=126) cout<<ch-1<<endl; else cout<<“Input Error!”; if((ch+1)>=32&&(ch+1)<=126) cout<<ch+1<<endl; else cout<<“Input Error!”; return 0; }