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>
#include<stdlib.h>


int main(void){
    int a,b;
    scanf("%d %d",&a,&b);
    char S[a+b+1];
    for(int i=0;i<a+b+1;i++){
        S[i]='X';
    }
    scanf("%s",S);
    for(int i=0;i<a;i++){
        if(S[i]<'0' || S[i]>'9'){
            printf("No");
            exit(0);
        }
    }
    if(S[a]!='-'){
        printf("No");
        exit(0);
    }
    for(int i=a+1;i<a+b+1;i++){
        if(S[i]<'0' || S[i]>'9'){
            printf("No");
            exit(0);
        }
    }
            printf("Yes");
    return 0;
}