using System;
using System.Collections.Generic;

class Program
{
    static string InputPattern = "InputX";

    static List<string> GetInputList()
    {
        var WillReturn = new List<string>();

        if (InputPattern == "Input1") {
            WillReturn.Add("Alice 114 R");
            WillReturn.Add("Bob 514 S");
            //Bob
        }
        else if (InputPattern == "Input2") {
            WillReturn.Add("touritsu 99999999999999999999 P");
            WillReturn.Add("Peter 99999999999999999998 R");
            //touritsu
        }
        else if (InputPattern == "Input3") {
            WillReturn.Add("Taro 0 R");
            WillReturn.Add("Hanako 0 S");
            //-1
        }
        else {
            string wkStr;
            while ((wkStr = Console.ReadLine()) != null) WillReturn.Add(wkStr);
        }
        return WillReturn;
    }

    static void Main()
    {
        List<string> InputList = GetInputList();

        string[] wkArr = { };
        Action<string> SplitAct = (pStr) => wkArr = pStr.Split(' ');

        SplitAct(InputList[0]); string SA = wkArr[0], PA = wkArr[1];
        SplitAct(InputList[1]); string SB = wkArr[0], PB = wkArr[1];

        int MaxLen = Math.Max(PA.Length, PB.Length);
        PA = PA.PadLeft(MaxLen, '0');
        PB = PB.PadLeft(MaxLen, '0');

        int Comp = PA.CompareTo(PB);
        if (Comp > 0) Console.WriteLine(SA);
        if (Comp < 0) Console.WriteLine(SB);
        if (Comp == 0) Console.WriteLine(-1);
    }
}