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 (Clang 3.8.0) (judge verdict: Wrong Answer)

#include <stdio.h>

int main()
{
	int A,B;
	char S[13];
	scanf("%d%d", &A, &B);
	scanf("%s", S);
	int i = 0;
	while (i < A)
	{
		if (!(S[i] >= '0' && S[i] <= '9'))
		{
			printf("No");
			return 0;
		}
		i++;
	}
	if (S[i] != '-')
	{
		printf("No");
		return 0;
	}
	i++;
	while (i < B)
	{
		if (!(S[i] >= '0' && S[i] <= '9'))
		{
			printf("No");
			return 0;
		}
		i++;
	}
	printf("Yes");
	return (0);
}