#include <bits/stdc++.h>
using namespace std;
long long pow_mod(long long x, long long y) {
  long long r = 1;
  for (; y; y >>= 1, x = (long long)x * x % 1000000007)
    if (y & 1) r = (long long)r * x % 1000000007;
  return r;
}
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  int x, y, z;
  cin >> x >> y >> z;
  if (x == y && z == 0) {
    cout << "0"
         << "\n";
  } else if (x > y + z) {
    cout << "+"
         << "\n";
  } else if (y > x + z) {
    cout << "-"
         << "\n";
  } else {
    cout << "?"
         << "\n";
  }
  return 0;
}
