#include <bits/stdc++.h>
using namespace std;
const long long int mod = 1000000007;
int main() {
  int x, y, z;
  cin >> x >> y >> z;
  int sum = x - y;
  if (sum + z > 0 && sum - z > 0)
    cout << "+";
  else if (sum + z < 0 && sum - z < 0)
    cout << "-";
  else if (sum == 0 && z == 0)
    cout << "0";
  else
    cout << "?";
}
