#include <bits/stdc++.h>
using namespace std;
int main() {
  long long i, j, k, l, m, n, t, a, b, c;
  cin >> a >> b >> c;
  l = a + (-1 * b);
  if (c == 0 && abs(l) == 0) {
    cout << "0" << endl;
  } else if (l > 0 && l > c) {
    cout << "+" << endl;
  } else if (l < 0 && abs(l) > c) {
    cout << "-" << endl;
  } else if (abs(l) <= c) {
    cout << "?" << endl;
  }
  return 0;
}
