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 5.4.1) (judge verdict: Accepted)

#include <stdio.h>
#include <stdlib.h>

int main()
{
	int A, B;
	char S[12];
	scanf("%d %d", &A, &B);
	scanf("%s", S);

	int i, flag = 1;
	for (i = 0; i < A; i++) {
		if (S[i] < '0' || S[i] > '9') flag = 0;
	}
	if (S[i] != '-') flag = 0;
	for (i++; i < A + B + 1; i++) {
		if (S[i] < '0' || S[i] > '9') flag = 0;
	}
	
	if (flag == 1) printf("Yes\n");
	else printf("No\n");
	fflush(stdout);
	return 0;
}