#include <bits/stdc++.h>
using namespace std;
const int INF = 0x3f3f3f3f;
int main() {
  ios::sync_with_stdio(false);
  int a, b, c;
  cin >> a >> b >> c;
  if (a > b + c)
    cout << "+";
  else if (a == b and !c)
    cout << "0";
  else if (b > a + c)
    cout << "-";
  else
    cout << "?";
  cout << endl;
  return 0;
}
