#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m, t, i, j, p, q, r, a, b, c, cnt = 0, cnt1 = 0;
  cin >> a >> b >> c;
  if (c == 0) {
    if (a > b)
      cout << "+" << endl;
    else if (b > a)
      cout << "-" << endl;
    else
      cout << 0 << endl;
  } else {
    if (a > b) {
      if (b + c < a)
        cout << "+" << endl;
      else
        cout << "?" << endl;
    } else if (a < b) {
      if (a + c < b)
        cout << "-" << endl;
      else
        cout << "?" << endl;
    } else
      cout << "?" << endl;
  }
}
