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 9.2.1) (judge verdict: Wrong Answer)

#include <stdio.h>
int main()
 {

	unsigned long long len,i,a,b;
	scanf("%llu%llu",&a,&b);
	char s[1000];
	scanf("%s",s);
	len=strlen(s);
	if(s[a]!='-')
    {
        printf("No\n");      return 0;
    }
    for(i=0;i<len;i++)
    {
        if(s[i]=='-')i++;
        if((s[i]<'0'&&s[i]>'9'))
    {
        printf("No\n");      return 0;
    }
    }
    printf("Yes\n");
    return 0;
}