#include <bits/stdc++.h>
using namespace std;
const int imax = 1e9 + 7;
const long long lmax = 1e18;
vector<int> v;
string s;
int calc() {
  int a, b, c;
  cin >> a >> b >> c;
  if ((b + c) < a)
    cout << "+";
  else if ((a + c) < b)
    cout << "-";
  else if (a == b && c == 0)
    cout << "0";
  else
    cout << "?";
  return 0;
}
int main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  calc();
  cout << endl;
  return 0;
}
