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: Wrong Answer)

#include <stdio.h>

int main()
{
  char W[7][3] = { "SUN","MON","TUE","WED","THU","FRI","SAT"};
  char S[4];
  scanf("%s",&S);
  int i = 0;
  while (i < 7)
  {
    int k = 0;
    while (S[k] == W[i][k])
    {
      if (S[k] == '\0')
      {
        printf("%d",i);
        return(0);
      }
      k++;
    }
    i++;
  }
}