#include <stdio.h>


int array_eq(int arra[], int arrb[]){
    /* size of arra, arrb is always 26 because english has only 26 alphabets */
    for(int i = 0; i < 26; i++){
        if(arra[i] != arrb[i]) return 0;
    }
    return 1;
}

void scan_char(char str[], int arr[], int len){
    for(int i = 0; i < len; i++){
        arr[str[i]-'a']++;
    }
}

int main(){
    int len = 16;
    char stra[len], strb[len];
    int arra[26], arrb[26];
    for(int i=0; i<26; i++){
        arra[i] = 0;
        arrb[i] = 0;
    }
    scanf("%s%s", stra, strb);
    scan_char(stra, arra, len);
    scan_char(strb, arrb, len);
    if( array_eq(arra, arrb) ) printf("YES");
    else printf("NO");
}