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