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

    char S[A+B+1];

    scanf("%s",&S);

    int flag=0;

    for(int i=0; i<A; i++){
        if(S[i]<48 || S[i]>57){
            flag=1;
            goto x;
        }
    }


    if(S[A]=='-'){flag=0;}
    else{flag=1;goto x;}

    for(int i=A+1; i<A+B+1; i++){
            if(S[i]<48 || S[i]>57){
                    flag=1;
                    goto x;
                }
    }


    x:
    if(flag==1){
        printf("No");
    }
    else{
        printf("Yes");
    }
}