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.Collections.Generic;
using System.Linq;
using System.Numerics;
using static System.Console;
using static System.Math;

class Program
{
    static List<Edge>[] g;
    static void Main()
    {
        var s = new Dictionary<string, int> { ["SUN"] = 7, ["MON"] = 6, ["TUE"] = 5, ["WED"] = 4, ["THU"] = 3, ["FRI"] = 2, ["SAT"] = 1 };
        var N = ReadLine();
        WriteLine(s[N]);
    }
    static int[] ans;
    void DFS(int v, int p, int c)
    {
        var k = 0;
        foreach (var u in g[v])
        {
            if (k == c) k++;
            if (u.to != p)
            {

                ans[u.id] = k;
                DFS(u.to, v, k);
            }
            k++;
        }
    }
}

public struct Edge
{
    public int to;
    public int clr;
    public int id;

    public Edge(int t, int c, int i)
    {
        to = t;
        clr = c;
        id = i;
    }
}