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,i,judge;
    char S[12];

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

    judge=1;

    if(S[A]=='-'){
        for(i=0;i<A;i++){
            if(!(S[i]>='0'&&S[i]<='9')){
                judge = 0;
            }
        }
        for(i=A+1;i<A+B+1;i++){
            if(!(S[i]>='0'&&S[i]<='9')){
                judge = 0;
            }
        }
    }else{
        judge=0;
    }

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

    return 0;
}