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 (Clang 3.8.0) (judge verdict: Wrong Answer)

#include<stdio.h>

const int TRUE = 1;
const int FALSE = 0;
int main(){
    int a, b;
    scanf("%d%d", &a, &b);
    char s[11];
    scanf("%s", s);

    int ans = TRUE;
    for(int i = 0; i < a; i++){
        if(s[i] >= '0' && s[i] <= '9'){
            continue;
        }else{
            ans = FALSE;
        }
    }

    if(s[a] != '-'){
        ans = FALSE;
    }

    for(int i = a + 1; i < b; i++){
        if(s[i] >= '0' && s[i] <= '9'){
            continue;
        }else{
            ans = FALSE;
        }
    }

    printf("%s\n", ans ? "Yes" : "No");

}