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: Runtime Error)

#include <stdio.h>
int test(){
    int a,b;
    char s[16];
    char *sc,*sc2;
    scanf("%d",&a);
    scanf("%d",&b);
    scanf("%s",s);
    // printf("%s",s+a);
    sc = strchr( s , '-' );
    if(sc == NULL){
        //ハイフン存在チェック
        printf("[%s]\n","1");
        return 0;
    }
    // sc2 = strchr( s+strlen(sc)-1, '-' );
    printf("%s\n",sc2);
    if(sc2 != NULL){
        //ハイフン複数チェック
        // printf("[%s]\n","1.5");
        return 0;
    }
    // printf("%d\n",strlen(sc));
    if(strlen(sc) != b+1){
        printf("[%s]\n","2");
        //ハイフン位置
        return 0;
    }
    
    return 1;
}
int main(void){
    // Your code here!
    if(test() == 1){
        printf("%s","Yes");
    }else{
        printf("%s","No");
    }
    return 0;
}