# include <stdio.h>

int check(int, int, int);
int main()
{
	int m, d, y, day;
	char days[8][100] = {"Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"};
	char monthes[12][100] = {"January", "Febuary", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"};

	while(scanf("%d %d %d", &m, &d, &y) != EOF)
	{
		day = 0;
		if(!check(m, d, y))
			printf("%d/%d/%d is an invalid date.\n", m, d, y);
	}

	return 0;
}

int check(int check_m, int check_d, int check_y)
{
	if(check_m<=0 || check_d<=0 || check_y<=0)
		return 0;
}