#include <bits/stdc++.h>
using namespace std;
const long long init = 1e9 + 7;
const long long N = 1e5 + 7;
int main() {
  ios_base::sync_with_stdio(0);
  cin.tie(0);
  cout.tie(0);
  int x, y, z;
  cin >> x >> y >> z;
  int ans = x - y;
  if (ans == 0) {
    if (z == 0)
      cout << "0" << endl;
    else
      cout << "?" << endl;
  } else if (abs(ans) > z) {
    if (ans < 0)
      cout << "-" << endl;
    else
      cout << "+" << endl;
  } else
    cout << "?" << endl;
  return 0;
}
