#include <bits/stdc++.h>
using namespace std;
int main() {
  long long up, down, uncertain;
  cin >> up >> down >> uncertain;
  if (up == down && uncertain == 0) {
    cout << 0;
  } else if (up - down - uncertain > 0) {
    cout << "+";
  } else if (up - down + uncertain < 0) {
    cout << "-";
  } else {
    cout << "?";
  }
  return 0;
}
