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: Runtime Error)

use std::io::{Read, stdin};
fn main() {

    let mut buf = String::new();
    // 標準入力から全部bufに読み込む
    stdin().read_to_string(&mut buf).unwrap();

    // 読み込んだらStringを空白で分解する
    let mut iter = buf.split_whitespace();

    let n: usize = iter.next().unwrap().parse().unwrap();


    println!("{}", n);
}