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

int main(void){
    char A[11], B[11];
    int i = 0, j, a = 0, b = 0;
    scanf("%s%s", A, B);
    while(A[i] != '\0'){
        if(strchr(B,A[i]) == NULL || strchr(A,B[i]) == NULL){
            j = -1;
            break;
        }
        else{
            j = 1;
        }
        i++;
    }
    i = 0;
    while(A[i] != '\0'){
        a += A[i];
        b += B[i];
        i++;
    }
    if(j == 1 && a == b){
        printf("YES\n");
    }
    else{
        printf("NO\n");
    }
}