#include <stdio.h>
#include <string.h>
int twoip[1005][35];
void changetwo(int num, int i, int j)
{
	int q, chu = num;
	//printf("%d %d %d\n", num, i, j);
	j = j * 8;
	for(q = j; q > j-8; q--)
	{
		twoip[i][q] = chu % 2;
		chu = chu / 2;
	}
}
void twoten(int left)
{
	int j, i, t[35], v = 0;
	memset(t, 0, sizeof(t));
	for(i = 1; i <= left; i++)
		t[i] = twoip[1][i];
	for(i = 1; i <= 32; i = i + 8)
	{
		v = 0;
		for(j = i; j < i+8; j++)
		{
			v = v * 2 + t[j];
		}
		printf("%d", v);
		if(j < 30)
			printf(".");
	}
	printf("\n");
}
void twotenzi(int left)
{
	int j, i, t[35], v = 0;
	memset(t, 0, sizeof(t));
	for(i = 1; i <= left; i++)
		t[i] = 1;
	/*for(i = 1; i <= 32; i++)
		printf("%d", t[i]);*/
	//printf("\n");
	for(i = 1; i <= 32; i = i + 8)
	{
		v = 0;
		for(j = i; j < i+8; j++)
			v = v * 2 + t[j];
		printf("%d", v);
		if(j < 30)
			printf(".");
	}
	printf("\n");
}
int main()
{
	int n, num, i, j, left = 0;
	scanf("%d", &n);
	memset(twoip, 0, sizeof(twoip));
	for(num = 1; num <= n; num++)
	{
		int t1, t2, t3, t4;
		scanf("%d.%d.%d.%d", &t1, &t2, &t3, &t4);
		changetwo(t1, num, 1);
		changetwo(t2, num, 2);
		changetwo(t3, num, 3);
		changetwo(t4, num, 4);
	}
	/*for(i = 1; i <= n; i++)
	{
		for(j = 1; j <= 32; j++)
		{
			printf("%d", twoip[i][j]);
		}
		printf("\n");
	}*/
	for(j = 1; j < 33; j++)
	{
		int t, check = 1;
		for(i = 1; i <= n; i++)
		{
			if(i == 1)
				t = twoip[i][j];
			else if(t != twoip[i][j])
				check = 0;
		}
		if(check)
			left++;
		else break;
	}
	//printf("%d\n", left);
	twoten(left);
	twotenzi(left);
	return 0;
}