import java.io.*;

// 処理
class Process {
    private String A;
    private String B;

    Process(String A, String B) {
        this.A = A;
        this.B = B;
    }

    String getResult() {
        if(A.equals(B)) {
            return "YES";
        }

        int[] alphabetCountsOfA = new int[26];
        for(int i = 0; i < A.length(); i++) {
            alphabetCountsOfA[A.charAt(i) - 'a']++;
        }

        int[] alphabetCountsOfB = new int[26];
        for(int i = 0; i < B.length(); i++) {
            alphabetCountsOfB[B.charAt(i) - 'a']++;
        }

        for(int i = 0; i < alphabetCountsOfA.length; i++) {
            if(alphabetCountsOfA[i] != alphabetCountsOfB[i]) {
                return "NO";
            }
        }

        return "YES";
    }
}

public class Main {
    public static void main(String[] args) throws IOException {
        var bufferedReader = new BufferedReader(new InputStreamReader(System.in));
        var printWriter    = new PrintWriter(new BufferedWriter(new OutputStreamWriter(System.out)));

        // 入力
        String A = bufferedReader.readLine().trim();

        String B = bufferedReader.readLine().trim();

        // 出力
        printWriter.println((new Process(A, B)).getResult());

        bufferedReader.close();
        printWriter.close();
    }
}