#include<iostream>
#include<string>
using namespace std;
int main(){
    string str="";
    string cmp="";
    int count1[26]={0},count2[26]={0};
    int i=0;
    int count[26]={0}; 
    cin>>cmp>>str;
    int l=cmp.size();
    for(i=0;i<l;i++){  
        count1[str[i]-'A']++;
        count2[cmp[i]-'A']++;  
    } 
    for(i=0;i<26;i++){
        count[count1[i]]++;
        count[count2[i]]--;
    } 
    for(i=0;i<l;i++){
        if(count[i]!=0){
            cout<<"NO"<<endl;
            return 0;
        }
    }
    cout<<"YES"<<endl;
    return 0; 
}