#include<iostream>
#define swap(x, y, t) ((t) = (x), (x) = (y), (y) = (t))
using namespace std;

int main () {
	int n, x1, y1, x2, y2, t, count = 1;
	cin >> n;
	while (n--){
		bool n = false;
		cin >> x1 >> y1 >> x2 >> y2;
		if (x1 + y1 > x2 + y2) swap(x1, x2, t), swap(y1, y2, t), n = true;
		int s1 = x1 + y1, s2 = x2 + y2, d = s2 - s1, sum = 0;
		if (d){
			for (int i = s1 + 1; i <= s2; i++) sum += i + 1;
			sum += (s1 - x1) - (s2 - x2);
			}
		else
			sum += x2 - x1;
		if (n) sum = -sum;
		cout << "Case " << count++ << ": " << sum << endl;
	}
	return 0;
}