#include <bits/stdc++.h>
using namespace std;
int main() {
  string S;
  int A, B;
  cin >> A >> B;
  bool ret = true;
  for (int i = 0; i < A; ++i) {
    ret *= (S[i] != '-');
  }
  ret *= (S[A] == '-');
  for (int i = 0; i < B; ++i) {
    ret *= (S[A + 1 + i] != '-');
  }
  if (ret) {
    cout << "Yes" << endl;
  } else {
    cout << "No" << endl;
  }
}
