#include <bits/stdc++.h>
using namespace std;
void c_p_c() {}
void vector_display(vector<int>& v) {
  for (auto x : v) cout << x << " ";
}
void vector_insert(vector<int>& v, int n) {
  for (int i = 0; i < n; i++) {
    long long int x;
    cin >> x;
    v.push_back(x);
  }
}
int gcd(int a, int b) {
  if (b == 0) return a;
  return gcd(b, a % b);
}
int lcm(int a, int b) {
  int x, y;
  return (a * b) / gcd(a, b);
}
void vector_sort(vector<int>& v) { sort(v.begin(), v.end()); }
void solution() {
  int a, b, z;
  cin >> a >> b >> z;
  if (a == b and z != 0)
    cout << "?" << endl;
  else if (a == b and z == 0)
    cout << "0" << endl;
  else {
    if (a > b + z) {
      cout << "+" << endl;
    } else if (b > a + z)
      cout << "-" << endl;
    else
      cout << "?" << endl;
  }
}
int32_t main() {
  c_p_c();
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  ;
  solution();
  return 0;
}
