#include <bits/stdc++.h>
using namespace std;
int main() {
  int a, b, c, maxi = 0, ans;
  cin >> a >> b >> c;
  if (a > b)
    maxi = a, ans = a - b;
  else if (b > a)
    maxi = b, ans = b - a;
  else if (a == b)
    maxi = -1, ans = 0;
  if (maxi == a && ans > c)
    cout << '+' << endl;
  else if (maxi == b && ans > c)
    cout << '-' << endl;
  else if (maxi == -1 && ans >= c)
    cout << '0' << endl;
  else if (ans <= c)
    cout << '?' << endl;
  return 0;
}
