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