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;

class Solver
{
    string s;

    public void Scan() => s = Console.ReadLine();

    public void Solve()
    {
        var days = new List<string>() { "SUN", "MON", "TUE", "WED", "THU", "FRI", "SAT" };
        var n = days.IndexOf(s);
        const int daysInWeek = 7;
        var answer = daysInWeek - n;
        System.Console.WriteLine(answer);
    }
}

class Program
{
    static void Main(string[] args)
    {
        var solver = new Solver();
        solver.Scan();
        solver.Solve();
    }
}