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