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