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