#include <bits/stdc++.h>
const int inf = 0x3f3f3f3f;
const int inn = 0x80808080;
using namespace std;
const int maxm = 1e3 + 5;
int main() {
  int x, y, z;
  cin >> x >> y >> z;
  if (y + z < x) {
    cout << '+' << endl;
    return 0;
  }
  if (x + z < y) {
    cout << '-' << endl;
    return 0;
  }
  if (x == y && z == 0) {
    cout << 0 << endl;
    return 0;
  }
  cout << '?' << endl;
  return 0;
}
