#include <bits/stdc++.h>
using namespace std;
const int mod = 1e9 + 7;
const long long infl = 0x3f3f3f3f3f3f3f3fLL;
const int infi = 0x3f3f3f3f;
void solve() {
  int x, y, z;
  cin >> x >> y >> z;
  int res = x - y;
  if (res + z > 0 && res - z > 0)
    cout << "+";
  else if (res + z == 0 && res - z == 0)
    cout << "0";
  else if (res + z < 0 && res - z < 0)
    cout << "-";
  else
    cout << "?";
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(0);
  cout.tie(0);
  int t = 1;
  while (t--) {
    solve();
  }
}
