#include <bits/stdc++.h>
using namespace std;
int main() {
  int x1, y1, z, x, y;
  cin >> x1 >> y1 >> z;
  x = x1 - y1 + z;
  y = x1 - y1 - z;
  if (x > 0 && y > 0)
    cout << "+"
         << "\n";
  else if (x < 0 && y < 0)
    cout << "-"
         << "\n";
  else if (x == 0 && y == 0)
    cout << "0"
         << "\n";
  else
    cout << "?"
         << "\n";
}
