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 OCaml (4.10.0) (judge verdict: Accepted)

let sunday week = 
    if week = "MON" then 6
    else if week = "TUE" then 5
    else if week = "WED" then 4
    else if week = "THU" then 3
    else if week = "FRI" then 2
    else if week = "SAT" then 1
    else 7

let ans = sunday (read_line ())

let () = print_endline @@ string_of_int ans