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 a,b,i,j,flag;
int main()
{
	char s[a+b+1];
	scanf("%d%d",&a,&b);
	scanf("%s",s);
	if((1<=a)&&(b<=5))
	{
	flag=1;
	}
	for(i=0;i<a;i++)
	{
		if((0<=s[i])||(s[i]<=9))
		{
		flag=1;
		}
	}
	for(j=a+2;j<b;j++)
	{
		if((0<=s[j])||(s[j]<=9))
		{		
		flag=1;
		}
	}
	if(s[a+1]=='-')
	{
	flag=1;
	}
	if(flag==1)
	{
	puts("yes");
	}
	else
	{
	puts("no");
	}
	return 0;
}