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>
#include <string.h>
#include <math.h>
#include <stdlib.h>

int main()
{
	int a,b,f=0,i;
	scanf("%d %d",&a,&b);
	char str[a+b+2];
	scanf("%s",str);
	int counthyp=0;
	for (i=0;i<strlen(str);i++)
	{
		int numtest=str[i]-'0';
		int hyphentest=str[i]-'-';
		int hyphencheck=str[a]-'-'+2;
		
		if (hyphencheck==2)
		{
			f=1;
			counthyp++;
			if (counthyp==1 && i==a)
				f=1;
			else
				f=0;;
		}
		if(numtest>=0 && numtest<=9)
		{
			f=1;
		}
	}
	if (counthyp!=1)
		f=0;
	if (f)
		printf("Yes\n");
	else
		printf("No\n");
	return 0;
}