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