#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
using namespace std;
#define rep(i,n) for(int i=0;i<(n);i++)

int numa[30];
int numb[30];

int main(void){
	string a, b; cin >> a >> b;
	rep(i, 30) numa[i] = numb[i] = 0;

	rep(i, a.size()){
		numa[a[i] - 'a']++;
		numb[b[i] - 'a']++;
	}
	rep(i, 30){
		if(numa[i] != numb[i]){
			printf("NO\n");
			return 0;
		}
	}
	printf("YES\n");
	return 0;
}