import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.HashMap;
import java.util.Map;

public class No00000069_Main {

	public static void main(String[] args) throws IOException {

		BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

		String a = br.readLine();
		String b = br.readLine();

		System.out.println(check(getCnt(a), getCnt(b)));

	}

	private static Map<String, Integer> getCnt(String str) {
		Map<String, Integer> ret = new HashMap<String, Integer>();
		char[] cArr = str.toCharArray();
		for(char c : cArr) {
			String s = String.valueOf(c);
			if(ret.containsKey(s)) {
				ret.put(s, ret.get(s) + 1);
			} else {
				ret.put(s, 1);
			}
		}
		return ret;
	}

	private static String check(Map<String, Integer> aMap, Map<String, Integer> bMap) {
		for(Map.Entry<String, Integer> ent : aMap.entrySet()) {
			if(!(bMap.containsKey(ent.getKey()) && (bMap.get(ent.getKey()) == ent.getValue()))) {
				return "NO";
			}
		}
		return "YES";
	}
}