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