import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;

public class Main{
	public static void main(String[] args) {
		try (BufferedReader br = 
				new BufferedReader(new InputStreamReader(System.in))) {
			// char→intに変換し、ソートと比較を行う
			char[] a = br.readLine().toCharArray();
			char[] b = br.readLine().toCharArray();
			int[] aCode = toCode(a);
			int[] bCode = toCode(b);

			Arrays.sort(aCode);
			Arrays.sort(bCode);

			for (int i = 0; i < aCode.length; i++) {
				if (aCode[i] != bCode[i]) {
					System.out.println("NO");
					return;
				}
			}
			System.out.println("YES");

		} catch (IOException e) {
			e.printStackTrace();
		}
    }
	
	static int[] toCode(char[] chr){
		int[] code = new int[chr.length];
		for(int i =0; i < chr.length; i++){
			code[i] = (int)chr[i];
		}
		return code;
	}
}