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