#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  int x, y, z;
  cin >> x >> y >> z;
  if (x > y and (x - y) > z)
    cout << "+" << endl;
  else if (y > x and (y - x) > z)
    cout << "-" << endl;
  else if ((x == y) and z == 0)
    cout << "0" << endl;
  else
    cout << "?" << endl;
  return 0;
}
