#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b;
  cin >> a >> b;
  char s[a + b + 1];
  cin >> s;
  for (int i = 0; i < a; i++)
    if (!(0 <= s[i] && s[i] <= 9)) cout << "No" << endl;
  return 0;
  if (s[a] != '-') cout << "No" << endl;
  return 0;
  for (int i = a + 1; i <= a + b; i++)
    if (!(0 <= s[i] && s[i] <= 9)) cout << "No" << endl;
  return 0;
  cout << "Yes" << endl;
}
