#include <bits/stdc++.h>
using namespace std;
const long long int INF = 1e15;
const long long int MOD = 1e9 + 7;
template <typename T>
using vector2 = vector<vector<T>>;
template <typename T>
vector2<T> initVec2(size_t n0, size_t n1, T e = T()) {
  return vector2<T>(n0, vector<T>(n1, e));
}
template <typename T>
using vector3 = vector<vector<vector<T>>>;
template <typename T>
vector3<T> initVec3(size_t n0, size_t n1, size_t n2, T e = T()) {
  return vector3<T>(n0, vector2<T>(n1, vector<T>(n2, e)));
}
signed main() {
  ios::sync_with_stdio(false);
  cin.tie(0);
  long long int x, y, z;
  cin >> x >> y >> z;
  long long int a = x - y;
  if (a > 0 && a - z > 0) {
    cout << "+" << endl;
    return 0;
  }
  if (a < 0 && a + z < 0) {
    cout << "-" << endl;
    return 0;
  }
  if (a == 0 && z == 0) {
    cout << 0 << endl;
    return 0;
  }
  cout << "?" << endl;
  return 0;
}
