View Code of Problem 3689

import java.math.BigInteger;
import  java.util.*;
public class Main {

		public static void main(String[] args) {
			Scanner scanner = new Scanner(System.in);	
			int t = scanner.nextInt();
			int k=1;
			for(int i=0; i<t; i++) {
				BigInteger a = scanner.nextBigInteger();
				BigInteger b = scanner.nextBigInteger();
				System.out.println("Case #"+ k++ +":");
				System.out.println(a.subtract(b));
			}	
		}
}

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