#include <bits/stdc++.h>
using namespace std;
int main() {
  ios::sync_with_stdio(false);
  int n, m, k;
  cin >> n >> m >> k;
  int result = n - m;
  if (k >= abs(result) && k != 0) {
    cout << "?" << '\n';
  } else {
    if (result > 0)
      cout << "+\n";
    else if (result < 0)
      cout << "-\n";
    else if (result == 0)
      cout << "0\n";
  }
  return 0;
}
