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: Accepted)

#include <stdio.h>

int main(void)
{
	int a,b,c=0,e,g=0;
	char d[15];
	scanf("%d %d",&a,&b);
	scanf("%s",d);
	int f=a+1,h=a+b+1;
	if(d[a]=='-'){
		while(c<a){
			if(d[c]>='0'&&d[c]<='9'){
				e=0;
			}else{
				g=1;
			}
			c++;
		}
		while(f<h){
			if(d[f]>='0'&&d[f]<='9'){
				e=0;
			}else{
				g=1;
			}
			f++;
		}
	}else{
		g=1;
	}
	if(g==0){
		printf("Yes");
	}else{
		printf("No");
	}
	return 0;
}