import java.util.Scanner;

public class Main {
	public static final String YES = "YES";
	public static final String NO = "NO";
	public static final char CHECKED = '-';

	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		String inputA = sc.nextLine();
		String inputB = sc.nextLine();

		System.out.println(canRearrange(inputA, inputB));
	}

	public static String canRearrange(final String inputA, final String inputB) {

		// 配列の長さの一致を確認
		if (inputA.length() != inputB.length()) {
			return NO;
		}

		// char配列に変換
		char[] charArrayA = inputA.toCharArray();
		char[] charArrayB = inputB.toCharArray();

		// 順番に存在するか確認
		for (int i = 0; i < charArrayA.length; i++) {
			boolean found = false;
			for(int j = 0; j < charArrayB.length; j++) {
				if (charArrayA[i] == charArrayB[j]) {
					found = true;
					charArrayB[j] = CHECKED;
					break;
				}
			}
			if(!found) return NO;
		}
		return YES;
	}
}