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;
char s[20];
int pos = 1;
scanf("%d %d",&a,&b);
scanf("%s",s);

if(s[a] != '-'){ //itu [A] karena di index 1,+1 -1 = karena di soal index 1 di awal
	pos = 0;
}

for(int i = 0;s[i]!='\0';i++){ //\0 (selama dia tidak sampai ke null maka loop terus
	if(i != a){//jika karakter bukan di A maka cek(selain -)
		if(s[i]< '0' || s[i]> '9'){ //kalau bukan di rentang ini bye
		 pos = 0;
		 break; //karena false break aja dari loopnya
		}
    }	
}
	//kalau benar dan tidak false print yes
	(pos) ? printf("Yes\n") : printf("No\n");
	return 0;
}