q199026408

#include <iostream>

using namespace std;

int main()
{
    int n, b, k, s = 0;
    cin >> n >> b >> k;

    while (n > 0)
    {
        if (n % 10 == b) s++;
        n /= 10;
    }

    if (k == s)
        cout << k << endl;
    else
        cout << ((s > k) ? "YES" : "NO") << endl;

    return 0;
}