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;
using System.Linq;
using System.Collections.Generic;
using System.Numerics;
namespace AtCoder
{
    enum Week
    {
        SAT = 1,
        FRI,
        THU,
        WED,
        TUE,
        MON,
        SUN
    }
    public class Program
    {
        public static void Main(string[] args)
        {
            var input = Console.ReadLine();
            foreach (Week w in typeof(Week).GetEnumValues())
            {
                string day = Enum.GetName(typeof(Week), w);
                if (input == day) { Console.WriteLine((int)w); }
            }
        }
    }
}