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 Java8 (OpenJDK 1.8.0) (judge verdict: Accepted)

import java.util.Scanner;
public class Main {
	public static void main(String[] args) {
		Scanner sc = new Scanner(System.in);
		int A = sc.nextInt();
		int B = sc.nextInt();
		char[] S =sc.next().toCharArray();
		boolean flg = true;
		for (int i=0; i<A; i++) {
			if ( !(S[i]<='9' && S[i]>='0') ) {
				flg = false;
				break;
			}
		}
		for (int i=1; i<=B; i++) {
			if ( !(S[A+i]<='9' && S[A+i]>='0') ) {
				flg = false;
				break;
			}
		}
		if  (S[A]!='-') flg = false;
		if (S.length != (A+B+1)) flg = false;
		if (flg) System.out.println("Yes");
		else System.out.println("No");
	}
}