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