#include<bits/stdc++.h>                                 
using namespace std;                               
int ans=0;                                         
int main(){                                    
   char a[1001],b[1001];
   cin>>a>>b;
   int s=strlen(a);
    for(int i=0;i<s;i++){
   	   if(a[i]>='a'&&a[i]<='z'){
            a[i]=a[i]+'A'-'a';
       }
        if(b[i]>='a'&&b[i]<='z'){
            b[i]=b[i]+'A'-'a';                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                   
       }
    }
    for(int i=1;i<=s;i++){
        if(a[i]!=b[i]){
            cout<<"no";
            return 0;
        }
    }
    cout<<"yes";
}