#include <bits/stdc++.h>
using namespace std;
signed main() {
  {
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    cout.tie(0);
  }
  long long x, y, z;
  cin >> x >> y >> z;
  if (x == y && !z)
    cout << '0' << "\n";
  else if (x - z > y)
    cout << '+' << "\n";
  else if (y - z > x)
    cout << '-' << "\n";
  else
    cout << '?' << "\n";
}
