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: Wrong Answer)

#include<stdio.h>
#include<stdlib.h>
#include<string.h>
#include<limits.h>

int pw(int n) {
    if(n==0) {
        return 1;
    }
    int i;
    int ans = 1;
    for(i=0; i<n; i++) {
        ans *=10;
    }
    return ans;
}

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

    int n;
    int ans = 0;
    for(n=1; n<=N; n++) {
        int number = n;
        int digit = 0;
        while(number!=0) {
            number = number / 10;
            ++digit;
         }

        int i;
        int sum = 0;
        for(i=0; i<digit; i++) {
            sum += (n/pw(i)) % 10;
        }
        if(sum >= A && sum <= B) {
            ans += n;
        }
    }
    printf("%d\n", ans);
    return 0;
}