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