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