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