#include <stdio.h>
#include <map>
int main(){
    //iuput
    char A[10+1];
    char B[10+1];
    scanf("%s",A);
    scanf("%s",B);

    //string length
    int length;
    for (int i = 0;i < 10+1;i++){
        if (A[i] == '\0'){
            length = i;
            break;
        }
    }

    //create map
    std::map<char,int> count_A;
    std::map<char,int> count_B;
    for (int i = 0;i < length;i++){
        count_A[A[i]] = 0;
        count_B[B[i]] = 0;
    }
    for (int i = 0;i < length;i++){
        count_A[A[i]]++;
        count_B[B[i]]++;
    }

    //output
    if (count_A == count_B){
        printf("YES\n");
    }else{
        printf("NO\n");
    }
    return 0;
}