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 C (GCC 9.2.1) (judge verdict: Runtime Error)

#include <stdio.h>
#include <string.h>

int main() {
	int A, B, P;
	char S[A + B + 1];
	 scanf("%d %d", &A, &B);
	 scanf("%s", &S);
	if (strlen(S) != A + B + 1) {
		printf("No\n");
		return 0;
	}
	if (S[A] != '-') {
		printf("No\n");
		return 0;
	}
	for (int i = 0; i < A; i++) {
		P = S[i] - '0';
		if (P < 0 || P > 9) {
			printf("No\n");
			return 0;
		}
	}
	for (int i = A + 1; i < A + B + 1; i++) {
		P = S[i] - '0';
		if (P < 0 || P > 9) {
			printf("No\n");
			return 0;
	    }
    }
    printf("Yes\n");
    return 0;
}