#include <bits/stdc++.h>
using namespace std;
signed main() {
  signed x, y, z;
  cin >> x >> y >> z;
  signed a1 = x + z;
  signed b1 = y;
  signed a2 = x;
  signed b2 = y + z;
  if (a1 == b1) {
    if (a2 == b2) {
      cout << "0" << endl;
      return 0;
    }
    cout << "?" << endl;
    return 0;
  }
  if (a1 > b1) {
    if (a2 > b2) {
      cout << "+" << endl;
      return 0;
    } else
      cout << "?" << endl;
    return 0;
  }
  if (a1 < b1) {
    if (a2 < b2) {
      cout << "-" << endl;
      return 0;
    } else
      cout << "?" << endl;
  }
  return 0;
}
