using System;
using System.Linq;
using System.Collections;
using System.IO;
using System.Collections.Generic;
using System.Text;
using System.Numerics;
using System.Runtime.Intrinsics.X86;
using System.Buffers;
using System.Diagnostics;
using System.Runtime.CompilerServices;
using static InputUtility;

class Program
{
    static void Main()
    {
        InputNewLine();
        var (a, p, q) = (NextInt32, NextString, NextString);

        Console.WriteLine(p == q ? "No" : "Yes");
    }
}

public static class InputUtility
{
    private static string[]? s_inputs;
    private static string? s_raw;
    private static int s_index = 0;

    private static void Init() => s_index = 0;
    public static int NextInt32 => int.Parse(s_inputs![s_index++]!);
    public static uint NextUInt32 => uint.Parse(s_inputs![s_index++]!);
    public static long NextInt64 => long.Parse(s_inputs![s_index++]!);
    public static string NextString => s_inputs![s_index++];
    public static char NextChar => s_inputs![s_index++][0];
    public static int[] GetInt32Array() => s_inputs!.Select(int.Parse).ToArray();
    public static long[] GetInt64Array() => s_inputs!.Select(long.Parse).ToArray();
    public static string GetRawString() => s_raw!;
#if DEBUG
    private static TextReader? s_textReader;
    public static void SetSource(string path) => s_textReader = new StringReader(File.ReadAllText(path));
#endif
    public static bool InputNewLine()
    {
#if DEBUG
        if (s_textReader is TextReader sr)
        {
            Init();
            s_raw = sr.ReadLine()!;
            s_inputs = s_raw.Split(' ', StringSplitOptions.RemoveEmptyEntries);
            return true;
        }
#endif
        Init();
        s_raw = Console.ReadLine()!;
        s_inputs = s_raw.Split(' ', StringSplitOptions.RemoveEmptyEntries);
        return true;
    }
}