import static java.lang.Integer.parseInt;

import java.util.Scanner;

class A {

	static Scanner s = new Scanner(System.in);

	public static void main(String[] args) {
		String in[];
		int r=0;

		s.nextLine();
		while(s.hasNextLine()) {
			in = s.nextLine().split("( |:)");
			r += (parseInt(in[2])-parseInt(in[0])+24)%24*60 + (parseInt(in[3])-parseInt(in[1]));
			System.out.println(r);
		}
	}
}