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 9.2.1) (judge verdict: Wrong Answer)

#include <stdio.h>
#include <string.h>
int main(void){
    
    int i,a,b;
    char s[100];
    
    scanf("%d%d%s",&a,&b,s);
    
    if((strlen(s)==a+b+1)&&(s[a]-'-'==0)){
        for(i=0;i<a+b+1;i++){
            if(i==a) i++;
            if((s[i]-'0'>=0)&&(s[i]-'0'<10)){}
            else{
                printf("No\n");
                return 0;
            }
        }
    }
    else printf("No\n");
    printf("Yes\n");
    
    return 0;
}