#include <bits/stdc++.h>
using namespace std;
int main(int argc, char const *argv[]) {
  int x, y, z;
  cin >> x >> y >> z;
  int count = x - y;
  if (count > 0 && count > z)
    cout << '+';
  else if (count < 0 && -1 * count > z)
    cout << '-';
  else if (count == 0 && z == 0)
    cout << '0';
  else
    cout << '?';
  return 0;
}
