#include <iostream>
using namespace std;

int main(void){
    string A, B;
    int a = 0, b = 0;

    cin >> A >> B;
    for(char c: A) a += c;
    for(char c: B) b += c;
    if(a-b) cout << "NO" << endl;
    else cout << "YES" << endl;

    return 0;
}