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