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 Rust (1.15.1) (judge verdict: Accepted)

use std::io;
use std::collections::HashMap;

fn main() {
    let mut map = HashMap::new();
    map.insert("SUN".to_string(), 0);
    map.insert("MON".to_string(), 1);
    map.insert("TUE".to_string(), 2);
    map.insert("WED".to_string(), 3);
    map.insert("THU".to_string(), 4);
    map.insert("FRI".to_string(), 5);
    map.insert("SAT".to_string(), 6);

    let mut s = String::new();
    io::stdin().read_line(&mut s).ok();
    println!("{}", 7-map.get(s.trim()).unwrap());
}