#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, mx, mn;
  cin >> a >> b >> c;
  mn = min(a, b);
  mx = max(a, b);
  if (c != 0 && (c > a && c > b || mn + c >= mx)) {
    cout << "?";
  } else if (a > b && a > c) {
    cout << "+";
  } else if (b > a && b > c) {
    cout << "-";
  } else {
    cout << 0;
  }
}
