#include<iostream>

using namespace std;

int main() {
	int n;
	cin >> n;
	for (int i = 0;i < n;i++) {
		int a, b;
		int hour=13, min=15;
		char c;
		cin >> a >> c >> b;
		hour = hour + a;
		min = min + b;
		if (min>=60) {
			min = min - 60;
			hour++;
			
		}
		if (hour >= 24) {
			hour = hour - 24;
		}
		cout << hour << ":" << min << endl;
	}
	return 0;
}

全局变量和局部变量以及归零要注意；