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(){
	int a,b,i,j;
	char s[10];
	char num[11]={'0','1','2','3','4','5','6','7','8','9'};

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

	if(s[a]=='-'){

		for(i=0;i<a+b+1;i++){
			if(i==a){
				continue;
			}
			for(j=0;j<9;j++){
				if(s[i]==num[j]){
					break;
				}
				else if(s[i]=num[9]){
					i+=100;
				}
			}
		}
		if(i==a+b+1){
			printf("Yes");
		}
		else{
			printf("No");
		}
	}
	else{
		printf("No");
	}
	return 0;
}