#include<bits/stdc++.h>
using namespace std;
char s[10000],s1[10000];
int main()
{
   gets(s);
   for(int i=0;i<strlen(s);i++){
	 if((s[i]>='a'&&s[i]<='z')||(s[i]>='A'&&s[i]<='Z'))
	 {
	   if(s[i]=='a')s1[i]='z';
	   else if(s[i]=='A')s1[i]='Z';
	        else s1[i]=s[i]-1;
	 }
	 else s1[i]=s[i]; 
   }
   cout<<s1;       
   return 0;
}