Problem:
Score : 100 points

Problem Statement

Given is a string S representing the day of the week today.

S is SUN, MON, TUE, WED, THU, FRI, or SAT, for Sunday, Monday, Tuesday, Wednesday, Thursday, Friday, and Saturday, respectively.

After how many days is the next Sunday (tomorrow or later)?

Constraints

S is SUN, MON, TUE, WED, THU, FRI, or SAT.

Input

Input is given from Standard Input in the following format:

S

Output

Print the number of days before the next Sunday.

Sample Input 1

SAT

Sample Output 1

1

It is Saturday today, and tomorrow will be Sunday.

Sample Input 2

SUN

Sample Output 2

7

It is Sunday today, and seven days later, it will be Sunday again.

Solution in C (GCC 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <string.h>
#define ONE_WEEK 7

int main(void)
{
	char day[7][4] = {"SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT"};
	char s[4];
	int i;

	scanf("%s", s);

	for (i = 0; i < ONE_WEEK; i++)
	{
		if (strcmp(s, day[i]) == 0)
		{
			printf("%d\n", ONE_WEEK - i);
			return 0;
		}
	}
}