/**
 * Hashmat is a brave warrior who with his group of young soldiers moves from one place to another to
 * fight against his opponents. Before Fighting he just calculates one thing, the difference between his
 * soldier number and the opponent’s soldier number. From this difference he decides whether to fight or
 * not. Hashmat’s soldier number is never greater than his opponent.
 * Input
 * The input contains two numbers in every line. These two numbers in each line denotes the number
 * soldiers in Hashmat’s army and his opponent’s army or vice versa. The input numbers are not greater
 * than 232. Input is terminated by ‘End of File’.
 * Output
 * For each line of input, print the difference of number of soldiers between Hashmat’s army and his
 * opponent’s army. Each output should be in seperate line.
 * Sample Input
 * 10 12
 * 10 14
 * 100 200
 * Sample Output
 * 2
 * 4
 * 100
 */

//https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&page=show_problem&problem=996

import java.util.Scanner;

public class HashmatWarriors {

	public static void main(String[] args) {
		Scanner input = new Scanner(System.in);
		String nextLine = input.nextLine();
		while (!"".equals(nextLine)) {
			String[] nums = nextLine.split(" ");
			long firstNum = Long.valueOf(nums[0]);
			long secondNum = Long.valueOf(nums[1]);
			System.out.println(Math.abs(secondNum - firstNum));
			nextLine = input.nextLine();
		}
	}
}
