#include<bits/stdc++.h>
using namespace std;
int main(){
	string a;
	getline(cin,a);
	for(int i=0;i<=a.length()-1;i++)
		if(a[i]>'A' and a[i]<='Y' or a[i]>'a' && a[i]<='y')cout<<char(a[i]-1);
		else if(a[i]=='z')cout<<"y";
		else if(a[i]=='Z')cout<<"Y";
		else cout<<a[i];
	return 0;
} 

大佬救我