Sample Input:
10 12
10 14
100 200

Sample Output:
2
4
100


大意:勇敢的將軍在開戰前會先評估敵軍跟我軍的差異，給敵軍跟我軍的數量，問相差總數多少



解法: 水題 輸出相減的絕對值即可


 import java.util.*;

public class UVA10055 {

 public static void main(String[] args) {

  Scanner sc = new Scanner(System.in);

  while (sc.hasNext()) {

   long N = sc.nextLong();
   long M = sc.nextLong();

   System.out.println(Math.abs(N - M));
  }

 }

}