#include <bits/stdc++.h>
using namespace std;
const int MOD = 1000 * 1000 * 1000 + 7;
const int INF = 0x3f3f3f3f;
const int MAX = 100009;
int x, y, z;
int main() {
  while (cin >> x >> y >> z) {
    string ans = "?";
    if (x > y + z)
      ans = "+";
    else if (y > x + z)
      ans = "-";
    else if (x == y && z == 0)
      ans = "0";
    cout << ans << endl;
  }
  return 0;
}
