class Program
{
    static void Main(string[] args)
    {
        string[] decision = Console.ReadLine().Split(' ');
        //0 = 先輩　1 = 自分
        //true = 問題なし　false = 問題あり
        bool angerFlg = true;
        if (decision[0].Length < decision[1].Length) {
            angerFlg = false;
        }
        if (angerFlg)
        {
            angerFlg = ComparisonNumber(decision);
        }

        if (angerFlg) {
            Console.WriteLine("Yes");
        }
        else
        {
            Console.WriteLine("No");
        }
    }

    private static bool ComparisonNumber(string[] decision)
    {
        bool angerFlg = true;
        for(int i = decision[0].Length-decision[1].Length ; i < decision[0].Length; i++)
        {
            if (Char.GetNumericValue(decision[0][i]) < Char.GetNumericValue(decision[1][i- (decision[0].Length - decision[1].Length)]))
            {
                angerFlg = false ;
                break;
            }
        }
        return angerFlg;
    }
}