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: Wrong Answer)

#include <stdio.h>

int main(void) {

	int a = 0, b = 0;
	int i = 0, j = 0;
	int flg = 1;
	char zip[10] = "";
	
	scanf("%d %d", &a, &b);
	scanf("%s", zip);

	while (zip[i] != '\0') {
		
		if (i < a && (zip[i] == '-')) {
			flg = 0;
			break;
		}
		else if ((i == a) && !(zip[i] == '-')) {
			flg = 0;
			break;
		}

		if (i > a) {
			j++;
		}
		i++;
	}

	if (j > 5)
		flg = 0;

	if (((a + b + 1) == i) && flg == 1) {
		printf("Yes\n");
	}
	else
		printf("No\n");
}