#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  long long int x, y, z;
  cin >> x >> y >> z;
  long long int p = 0, q = 0, r = 0;
  if ((x - y + z) > 0)
    p = 1;
  else if ((x - y + z) == 0)
    r = 1;
  else
    q = 1;
  if ((x - y - z) > 0)
    p = 1;
  else if ((x - y - z) == 0)
    r = 1;
  else
    q = 1;
  if (p && !q && !r)
    cout << "+", cout << "\n";
  else if (!p && q && !r)
    cout << "-", cout << "\n";
  else if (!p && !q && r)
    cout << "0", cout << "\n";
  else
    cout << "?", cout << "\n";
  cerr << "\nTime elapsed : " << 1000 * clock() / CLOCKS_PER_SEC << " ms\n";
  return 0;
}
