#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  int x, y, z;
  cin >> x >> y >> z;
  int diff = x - y;
  int up = diff + z;
  int down = diff - z;
  if (diff == 0 && z == 0) {
    cout << 0;
  } else if (up > 0 && down > 0) {
    cout << '+';
  } else if (up < 0 && down < 0) {
    cout << '-';
  } else {
    cout << '?';
  }
  return 0;
}
