UVa Problem ID 10055 (Hashmat The Brave Warrior)

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

public class Main {
	public static void main(String[] args) throws IOException 
    {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringBuffer sb=new StringBuffer("");
        String input;
        while ((input=br.readLine())!=null) {
			String s[]=input.split(" ");
			long a=Long.parseLong(s[0]);
			long b=Long.parseLong(s[1]);
			if(a>b)
				sb.append((a-b));
			else
				sb.append((b-a));
			sb.append("\n");
		}
        System.out.print(sb);
    }
}