#include <bits/stdc++.h>
using namespace std;
int main() {
  int first, second, z;
  cin >> first >> second >> z;
  if (first - second - z > 0)
    cout << "+";
  else if (first - second + z < 0)
    cout << "-";
  else if (first == second && z == 0)
    cout << "0";
  else
    cout << "?";
}
