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 (Clang 10.0.0) (judge verdict: Accepted)

#include <stdio.h>

int main(){
	int a,b;
	int flag  = 1;
	scanf("%d %d",&a,&b);		
	char s[a+b+5];
	scanf("%s",s);
	//s[a] != '-' ? flag = 0 : flag  = 1;
	if(s[a]!= '-'){
		flag = 0;
	}
		for(int i=0;s[i]!='\0';i++){
			if(i!=a){
				if(s[i]<'0' || s[i]>'9'){
					flag = 0;
				}
			
			}
		}
		flag==1 ? puts("Yes") : puts("No");
 	return 0;
}