#include <stdio.h>
int main (void) {
	int N;
	scanf ("%d", &N);
	int i, e, f = 0 , g = 0;
	int ek1 = 0, ek2 = 0, erez1 = 0, erez2 = 0, vr=0;
	for (i = 0; i < N; i++) {
		scanf ("%d %d:%d", &e, &f, &g);
		if (erez1 > erez2) ek1 += f*60 + g - vr;
		if (erez2 > erez1) ek2 += f*60 + g - vr;
		vr = f*60 + g;
		if (e == 1) erez1++;
		else erez2++;}
		f = 0;
		g = 2880;
		if (erez1 > erez2) ek1 += f*60 + g - vr;
		if (erez2 > erez1) ek2 += f*60 + g - vr;
		if (ek1/60 < 10) printf ("0");
		printf ("%d:", ek1/60);
		if (ek1%60 < 10) printf ("0");
		printf ("%d\n", ek1%60);
		if (ek2/60 < 10) printf ("0");
		printf ("%d:", ek2/60);
		if (ek2%60 < 10) printf ("0");
		printf ("%d", ek2%60);
}