include

using namespace std;

int main() {

long long m, k, x;
cin >> m >> k >> x;
int n = 0;
if (m < 0) {
	m = 0 - m;
}
for (; m > 0; m /= 10) {
	if (m % 10 == x) {
		n++;
	}
}
if (n == k) {
	cout << "YES";
} else {
	cout << "NO";
}
return 0;

}