백준 2420 사파리 월드 - Java

package Baekjoon;

import java.util.Scanner;

public class Baekjoon2420 {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		
		long a = sc.nextLong();
		long b = sc.nextLong();
		
		System.out.println(Math.abs(a-b));
        sc.close();
	}
}