```#include<bits/stdc++.h>
using namespace std;
#define LL long long
const int N = 1e5 + 10;
const int INF = 0x3f3f3f3f;
int numa[1000],numb[1000];
int cnta[1000],cntb[1000];
int main()
{
	string a,b;
	cin>>a>>b;
	if(a.size() != b.size())
	{
		cout<<"NO\n";
		return 0;
	}
	for(int i=0;i<a.size();i++)
	{
		numa[ a[i] ]++;
		numb[ b[i] ]++;
	}
	for(int i=65;i<=90;i++)
	{
		cnta[ numa[i] ]++;
		cntb[ numb[i] ]++;
	}
	for(int i=1;i<=100;i++)
	{
		if(cnta[i] != cntb[i])
		{
			cout<<"NO\n";
			return 0;
		}
	}
	cout<<"YES\n";
	return 0;
}