ex1-3.java

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

public class Main {

	public static void main(String args[]) {
		Scanner sc = new Scanner(System.in);
		String str1 = sc.next();
		String str2 = sc.next();
		HashMap<Character, Integer> count1 = new HashMap<Character, Integer>();
		HashMap<Character, Integer> count2 = new HashMap<Character, Integer>();

		if (str1.length() != str2.length()) {
			System.out.println("NO");
		} else {
			for (int i = 0; i < str1.length(); i++) {
				Character c1 = str1.charAt(i);
				Character c2 = str2.charAt(i);
				if (!count1.containsKey(c1)) {
					count1.put(c1, 0);
				}
				count1.put(c1, count1.get(c1) + 1);
				if (!count2.containsKey(c2)) {
					count2.put(c2, 0);
				}
				count2.put(c2, count2.get(c2) + 1);
			}

			Boolean flag = true;
			for (Map.Entry<Character, Integer> e : count1.entrySet()) {
				Character key = e.getKey();
				if (!(count2.containsKey(key) && e.getValue() == count2
						.get(key))) {
					flag = false;
				}
			}

			if (flag) {
				System.out.println("YES");
			} else {
				System.out.println("NO");
			}
		}

	}
}