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# (Mono 4.6.2.0) (judge verdict: Accepted)

using System;

namespace CantWaitForHolidays
{
    public enum Days
    {

        MON,
        TUE,
        WED,
        THU,
        FRI,
        SAT,
        SUN
    }

    class Program
    {
        static void Main(string[] args)
        {
            var input = Console.ReadLine();
            Days result;
            Enum.TryParse(input, out result);
            var daysUntilSun = result - Convert.ToInt32(Days.SUN);
            var output = Math.Abs(Convert.ToInt32(daysUntilSun));

            if (output == 0)
            {
                output = Convert.ToInt32(Days.SUN + 1);
            }

            Console.WriteLine(output);
        }
    }
}