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)

macro_rules! inputln {
    ($t:ty) => {{
        let mut l = String::new();
        std::io::stdin().read_line(&mut l).unwrap();
        l.trim().parse::<$t>().unwrap()
    }};
    ($($t:ty),*) => {{
        let mut l = String::new();
        std::io::stdin().read_line(&mut l).unwrap();
        let mut it = l.split_whitespace();
        ($(it.next().unwrap().parse::<$t>().unwrap(),)*)
    }};
    /*
    ($t:ty,$n:expr) => {{
        let mut l = String::new();
        std::io::stdin().read_line(&mut l).unwrap();
        let mut it = l.split_whitespace();
       vec![$(it.next().unwrap().parse::<$t>().unwrap(),)*]
    }};
    */
    ($t:ty; $n:expr) => {
        (0..$n).map(|_|
            get!($t)
        ).collect::<Vec<_>>()
    };
    ($($t:ty),*; $n:expr) => {
        (0..$n).map(|_|
            get!($($t),*)
        ).collect::<Vec<_>>()
    };
    ($t:ty ;;) => {
        {
            let mut line: String = String::new();
            std::io::stdin().read_line(&mut line).unwrap();
            line.split_whitespace()
                .map(|t| t.parse::<$t>().unwrap())
                .collect::<Vec<_>>()
        }
    };
    ($t:ty ;; $n:expr) => {
        (0..$n).map(|_| get!($t ;;)).collect::<Vec<_>>()
    };
}

fn main() {
    let s = inputln!(String);
    let result = match s.as_str() {
        "SUN" => 7,
        "MON" =>6,
        "TUE"=>5,
        "WED"=>4,
        "THU"=>3,
        "FRI"=>2,
        "SAT"=>1,
        _=>0
    };
    println!("{}",result);
}