#include <bits/stdc++.h>
using namespace std;
int main() {
  int u, d, n, sum, k;
  cin >> u >> d >> n;
  sum = u - d;
  k = abs(sum);
  if (sum == 0 && n == 0)
    cout << 0 << endl;
  else if (sum == 0 && n != 0)
    cout << "?" << endl;
  else if (sum > 0 && sum > n)
    cout << "+" << endl;
  else if (sum > 0 && sum <= n)
    cout << "?" << endl;
  else if (sum < 0 && k > n)
    cout << "-" << endl;
  else if (sum < 0 && k <= n)
    cout << "?" << endl;
}
