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++14 (GCC 5.4.1) (judge verdict: Wrong Answer)

#include <bits/stdc++.h>
#define ll long long
#define endl "\n"
using namespace std ;
const int N = 1e7 + 4;
void FastInputOutput()
{
    ios_base :: sync_with_stdio( 0 ) ;
    cin.tie( 0 ) ;
    cout.tie( 0 ) ;
}
inline ll LLD()
{
    ll ret;
    scanf("%lld", &ret);
    return ret;
}
inline int D()
{
    int ret;
    scanf("%d", &ret);
    return ret;
}
void bin( int x )
{
    if(!x)
        return;
    bin( x / 2 );
    cout << x % 2 ;
}
bool checkPrimeNumber(int n)
{
    bool flag = true;
    for(int j = 2 ; j <= n ; ++j)
    {
        if (n % j == 0)
        {
            flag = false;
            break;
        }
    }
    return flag;
}
bool cmp(string last, string first)
{
    if(last.size() < first.size())
        return 1;
    return 0;
}
int calculateDigit(int n)
{
    double temp = (double)(n);
    double a = 0.39908-(0.434294 * n);
    double b = log10( n ) ;
    double c = ( n + 0.5 ) * b ;
    double ans = c - abs( a ) ;
    return ceil(ans) ;
}
int findDigits(int n)
{
    double E = 2.71828182845904523536;
    double PI = 3.141592654;

    if (n < 0)
        return 0;
    if (n <= 1)
        return 1;

    double x = ((n * log10(n / E) +
                 log10(2.0 * PI * n) /
                 2.0));

    return floor(x) + 1;
}
ll fact(ll n)
{
    ll ans = 1 ;
    for(ll i = 1 ; i <= n ; ++i)
        ans *= i ;
    return ans ;
}
unsigned long long Factorial(int n)
{
    const unsigned int M = 1000000007;
    unsigned long long f = 1;
    for (int i = 1; i <= n; i++)
        f = (f*i) % M;

    return f;
}
bool checkNumber(int start, int ed, string s)
{
    int flag = 1;
    for(int i = start ; i <= ed ; ++i)
    {
        if(s[ i ] - '0' >= 0 && s[ i ] - '0' <= 9){}

        else{
            flag = 0 ;
            break ;
        }
    }
    return flag ? true : false ;
}
int main()
{
    FastInputOutput() ;
    int a, b ;
    cin >> a >> b ;
    string s ;
    cin >> s ;
    int flag = 0 ;
    int sz = a + b + 1 ;
    if(s[ a ] == '-' && checkNumber(a+1 , sz , s))
        flag = 1 ;
    if(flag)
        cout << "Yes" << endl ;
    else
        cout << "No" << endl ;
   // for(int i = 0 ; i < sz ; ++i)
     //   cout << (s[ i ] - 48) << " " ;
}