#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;
  }

  if(s[a] != '-') cout << "No" << endl;
  for(int j = a+1; j <= a+b; j++){
    if(!('0' <= s[j] && s[j] <= '9')) cout << "No" << endl;
  }
  else cout << "Yes" << endl;
    
}