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

void sort(char *src) {
    int i = 0;
    int j = 0;
    char tmp;
    for (i = 0; src[i + 1] != '\0'; i++) {
        for(j = i; src[j + 1] != '\0'; j++) {
            if (src[i] > src[j+1]){
            tmp = src[j+1];
             (src[j + 1]) = (src[i]);
            src[i] = tmp;
            }
        }
    }
}

int main(void) {
    char inputA[11] = { '\0' };
    char inputB[11] = { '\0' };
    scanf("%s", inputA);
    scanf("%s", inputB);
    unsigned int itr = 0;
    sort(inputA);
    sort(inputB);
    
    while (1) {
    if(inputA[itr] == '\0'){break;}
    if(inputA[itr] != inputB[itr]){
        printf("NO\n");
        return 0;
    }
        itr++;
    }
    printf("YES\n");
    return 0;
}