#include <stdio.h>

int main()
{
	int i, n, rez1=0, rez2=0, tim, x, y, min, last=0, fin1=0, fin2=0;
	scanf("%d", &n);
	for (i=0; i<n+1; i++)
	{
		if(i!=n)
		{
			scanf("%d %d:%d", &tim, &x, &y);
			min=60*x+y;
		}
		else
		{
			min=48*60;
		}

		if(rez1<rez2)
		{
			fin2+=min-last;
		}
		if(rez1>rez2)
		{
			fin1+=min-last;
		}

		if (tim==1)
		{
			rez1++;
		}
		if (tim==2)
		{
			rez2++;
		}

		last=min;

	}
	printf("%.2d:%.2d\n%.2d:%.2d", fin1/60, fin1%60, fin2/60, fin2%60);
	return 0;
}