#include <bits/stdc++.h>
using namespace std;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  long long testcases = 1;
  while (testcases--) {
    long long a, b, c;
    cin >> a >> b >> c;
    if (a > b) {
      if (a <= b + c) {
        cout << "?";
      } else {
        cout << "+";
      }
    } else if (b > a) {
      if (b <= a + c) {
        cout << "?";
      } else {
        cout << "-";
      }
    } else {
      if (c == 0) {
        cout << 0;
      } else {
        cout << "?";
      }
    }
    cout << endl;
  }
  return 0;
}
