Problem:
Score : 200 points

Problem Statement

The postal code in Atcoder Kingdom is A+B+1 characters long, its (A+1)-th character is a hyphen -, and the other characters are digits from 0 through 9.

You are given a string S. Determine whether it follows the postal code format in Atcoder Kingdom.

Constraints

1≤A,B≤5

|S|=A+B+1

S consists of - and digits from 0 through 9.

Input

Input is given from Standard Input in the following format:

A B
S

Output

Print Yes if S follows the postal code format in AtCoder Kingdom; print No otherwise.

Sample Input 1

3 4
269-6650

Sample Output 1

Yes

The (A+1)-th character of S is -, and the other characters are digits from 0 through 9, so it follows the format.

Sample Input 2

1 1
---

Sample Output 2

No

S contains unnecessary -s other than the (A+1)-th character, so it does not follow the format.

Sample Input 3

1 2
7444

Sample Output 3

No

Solution in Rust (1.42.0) (judge verdict: Accepted)

#![allow(unused_imports)]
// use itertools::Itertools;
use proconio::{input, marker::*};

fn main() {
    input! {
        a: usize,
        b: usize,
        mut s: Chars
    };
    for _ in 0..b {
        match s.pop().unwrap() {
            '-' => {
                println!("No");
                return;
            }
            _ => (),
        }
    }
    match s.pop().unwrap() {
        '-' => (),
        _ => {
            println!("No");
            return;
        }
    }
    for _ in 0..a {
        match s.pop().unwrap() {
            '-' => {
                println!("No");
                return;
            }
            _ => (),
        }
    }
    println!("Yes");
}