Char

using System;
using System.Linq;
class CompareCharArrays
{
    static void Main()
    {
        char[] first = Console.ReadLine().Split(' ').Select(char.Parse).ToArray();
        char[] second = Console.ReadLine().Split(' ').Select(char.Parse).ToArray();

        if (first.Length < second.Length)
        {
            Console.WriteLine("{0}\n{1}", string.Join("", first), string.Join("", second));
        }
        else if (first.Length > second.Length)
        {
            Console.WriteLine("{0}\n{1}", string.Join("", second), string.Join("", first));
        }
        else if (first.Length == second.Length)
        {
            for (int i = 0; i < Math.Min(first.Length, second.Length); i++)
            {

                if (first[i] > second[i])
                {
                    Console.WriteLine("{0}\n{1}", string.Join("", second), string.Join("", first));
                    break;
                }
                if (second[i] > first[i])
                {
                    Console.WriteLine("{0}\n{1}", string.Join("", first), string.Join("", second));
                    break;
                }
                if (second[i] == first[i])
                {
                    Console.WriteLine("{0}\n{1}", string.Join("", first), string.Join("", second));
                    break;
                }
            }
        }
    }
}