#include <bits/stdc++.h>

using namespace std;

struct TimE
{
	int h, s;
	TimE(int x, int y, int ind = 0)
	{
		if (ind == 0)
			h = x, s = y;
		else
			h = x, s = 60 * y / 10;
	}

	TimE operator +(TimE other)
	{
		int ns = other.s + s, nh = other.h + h;
		if (ns >= 60)
			ns -= 60, nh++;
		if (nh >= 24)
			nh -= 24;
		return (TimE) {nh, ns};
	}

	TimE operator -(TimE other)
	{
		int ns = s - other.s, nh = h - other.h;
		if (ns < 0)
			ns += 60, nh--;
		if (nh < 0)
			nh += 24;
		return (TimE) {nh, ns};
	}
};

void solve()
{
	int a, b;
	char ti[20];
	scanf("%d%d%s", &a, &b, ti);
	TimE ini(a, b);
	int th, ts = 0;
	if (isdigit(ti[5]))
		th = (ti[4]-'0') * 10 + ti[5]-'0';
	else
		th = ti[4]-'0';
	if (ti[5] == '.' || ti[6] == '.')
	{
		if (isdigit(ti[strlen(ti)-2]))
			ts = (ti[strlen(ti)-2]-'0') * 10 + ti[strlen(ti)-1]-'0';
		else
			ts = ti[strlen(ti)-1]-'0';
	}
	TimE utc(th, ts, 1);
	if (ti[3] == '+')
		ini = ini + utc;
	else
		ini = ini - utc;
	TimE u8(8, 0);
	ini = ini - u8;

	string hs, ss;
	if (ini.h == 0)
		hs = "00";
	else if (ini.h < 10)
		hs = "0", hs += (char)(ini.h+'0');
	else
		hs = (char)(ini.h/10+'0'), hs += (char)(ini.h%10+'0');
	if (ini.s == 0)
		ss = "00";
	else if (ini.s < 10)
		ss = "0", ss += (char)(ini.s+'0');
	else
		ss = (char)(ini.s/10+'0'), ss += (char)(ini.s%10+'0');
	printf("%s:%s\n", hs.c_str(), ss.c_str());
}

int main()
{
	int T;
	scanf("%d", &T);
	while (T--)
		solve();

	return 0;
}