#include <bits/stdc++.h>
using namespace std;

int main(){
  int a,b;
  cin >> a>>b;
  string s;
  cin >>s;
  if(s.size() != a+b+1){
    cout <<"No" << endl;
    return 0;
  }
  for(int i=0;i < a;i++){
    if(s.at(i) == '-'){
      cout << "No" << endl;
      cout<<i<<endl;
      return 0;
    }
  }
  for(int i=a+1;i < a+b+1;i++){
    if(s.at(i) == '-'){
      cout << "No" << endl;
      cout<<i<<endl;
      return 0;
    }
  }
  if(s.at(a) !='-'){
     cout << "No" << endl;
      cout<<i<<endl;
      return 0;
    }
  cout << "Yes" << endl;
}