#include <bits/stdc++.h>
using namespace std;
double n;
void solve() {
  cin >> n;
  cout << n / (n + 1) << '\n';
}
int32_t main() {
  ios::sync_with_stdio(0), cin.tie(0), cout.tie(0);
  long long int x, y, z;
  cin >> x >> y >> z;
  if (x > (z + y)) {
    cout << "+";
  } else if (y > (x + z)) {
    cout << "-";
  } else if (x == y and z == 0) {
    cout << "0\n";
  } else {
    cout << "?\n";
  }
  return 0;
}
