#include <stdio.h>
#include <string.h>

void Quicksort(char data[], int left, int right){
    int l = left, r = right;
    char pivot = data[(left + right) / 2];
    char temp;

    while(1){
        while (data[l] < pivot) l++;
        while (pivot < data[r]) r--;
        if(r < l) break;

        temp = data[l];
        data[l] = data[r];
        data[r] = temp;

        l++, r--;
    }
    if(left < r)  Quicksort(data, left, r);
    if(l < right) Quicksort(data, l, right);
}

int main(void){
    int i;
    int cnt = 0;
    char a[11], b[11];
    scanf("%s", a);
    scanf("%s", b);
    int len = strlen(a);

    Quicksort(a, 0, len-1);
    Quicksort(b, 0, len-1);

    for(i=0;i<len;i++){
        if(a[i]==b[i]) cnt++;
    }

    if(cnt==len){
        printf("YES");
    }else{
        printf("NO");
    }
    return 0;
}