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(void){
    int A, B, f1 = 1, i, f2 = 1;
    char S[10];

    scanf("%d %d", &A, &B);

    scanf("%s", S);

    if(S[A] == 45){
        f1 = 0;
    }

    for (i = 0; i < A + B + 1; i++)
    {
        if (S[i] < 48 || S[i] > 58){
            if(i != A){
                f1 = 1;
            }
        }
    }

    if(f1==0){
        printf("Yes\n");
    } else {
        printf("No\n");
    }

    return 0;
}