#include <bits/stdc++.h>
using namespace std;
int32_t main() {
  long long int x;
  long long int y;
  long long int z;
  cin >> x >> y >> z;
  if (x > y + z)
    cout << "+" << endl;
  else if (y > x + z)
    cout << "-" << endl;
  else if (x == y && z == 0)
    cout << "0" << endl;
  else
    cout << "?" << endl;
  return 0;
}
