using System;

public class Hello
{
    static void Main()
    {
        string[] line = Console.ReadLine().Trim().Split(' ');
        var a = line[0];
        var b = line[1];
        getAns(a, b);
    }
    static void getAns(string a, string b)
    {
        var aL = a.Length;
        var bL = b.Length;
        if (bL > aL) { Console.WriteLine("No"); return; }
        if (aL > bL) b = new string('0', aL - bL) + b;
        for (int i = 0; i < aL; i++)
        {
            if (b[i] > a[i]) { Console.WriteLine("No"); return; }
        }
        Console.WriteLine("Yes");
    }
}