using System;
using System.Collections.Generic;
using System.Linq;
using System.Numerics;
class Program
{
    static void Main()
    {
        int[] AandB = Array.ConvertAll(Console.ReadLine().Split(' '), r => int.Parse(r));
        Console.WriteLine(int.Parse((AandB[0] - AandB[1]).ToString().Replace("-", "")));
    }
}