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>
#include <stdlib.h>

int main(){
	int A, B, i;
	scanf("%d%d", &A, &B);
	char *S = (char *)malloc(sizeof(char) * (A + B + 2));
	scanf("%s", S);
	for(i = 0; i <= A + B; i++){
		if(i == A){
			if(S[i] != '-'){
				printf("No\n");
				return 0;
			}
		}
		else{
			if(!((int)'0' <= (int)S[i] && (int)S[i] <= (int)'9')){
				printf("No\n");
				return 0;
			}
		}
	}
	printf("Yes\n");
	return 0;
}