#include <iostream>
#include <string.h>
using namespace std;
void sort(int n, char a[]) {
    int i, j;
    char tmp;
    for (i=0; i<=n-2; i++) {
        for (j=i+1; j<n; j++) {
            if (a[i] > a[j]) {
                tmp = a[i];
                a[i] = a[j];
                a[j] = tmp;
            }
        }
    }
}
int main() {
    char a[10] = {'0'};
    char b[10] = {'0'};
    cin >> a >> b;
    sort(10, a);
    sort(10, b);
    if (!strcmp(a, b)) {
        cout << "YES" << endl;
    } else {
        cout << "NO" << endl;
    }
    return 0;
}