#include<iostream>
 #include<cstring> 
using namespace std;
int main(){
	char n=0;
	cin>>n;
	
	char a = n-1;
	char b = n+1;
	if(n=='a'){       
	    cout << n << b;
    }else if(n=='z'){
        cout<< a<< n;	
	}else if(n=='A'){
		cout  << n << b;
	}else if(n=='Z'){
		cout<< a<< n;
	}else{
		cout<<a<<n<<b;
	}
	return 0;
}