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, b;
	int i, ans=0;
	char s[15];

	scanf("%d%d", &a, &b);
	scanf("%s", s);

	if (s[a] == '-'){
		for (i = 0; i <= a; i++){
			if (0 <= s[i] - '0' && s[i] - '0' <= 9){
				ans = 1;
			}
			else if (s[i] == '-'){
				ans = 0; break;
			}
		}
		for (i = 1; i <= b; i++){
			if (0 <= s[a+i] - '0' && s[a+i] - '0' <= 9){
				ans = 1;
			}
			else if (s[i] != '-'){
				ans = 0; break;
			}
		}
	}
		

	if (ans)printf("Yes\n");
	else printf("No\n");

	return 0;
}