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()
{
	char s[20],kong;
	int i=0,a,b,x,flag=1;
	scanf("%d %d\n",&a,&b);
	scanf("%c",&kong);
	while(kong!='\n'){
		s[i]=kong;
		i++;
		scanf("%c",&kong);
	}
	if((a+b+1)!=(i)){
		flag=0;
	}
	if(s[a]!='-'){
		flag=0;
	}
	for(x=0;x<a;x++){
		if(s[x]<48 || s[x]>57 || s[x]==45){
			flag=0;
		}
	}
	for(x=i-1;x>a;x--){
		if(s[x]<48 || s[x]>57 || s[x]==45){
			flag=0;
		}
	}
	if(flag==1){
		printf("Yes");
	}else{
		printf("No");
	}
}