#include <bits/stdc++.h>
using namespace std;
int main() {
  int x, y, z;
  cin >> x >> y >> z;
  int dif = abs(x - y);
  if (dif <= z) {
    if (dif == 0 && z == 0) {
      cout << "0" << endl;
      return 0;
    }
    cout << "?" << endl;
  } else if (dif == 0) {
    cout << "0" << endl;
  } else if (dif > z) {
    if (x + z > y && y + z < x) {
      cout << "+" << endl;
    } else {
      cout << "-" << endl;
    }
  }
  return 0;
}
