#include <bits/stdc++.h>
using namespace std;
int dx[] = {0, 0, 1, -1, 1, -1, 1, -1};
int dy[] = {1, -1, 0, 0, -1, 1, 1, -1};
long long gcd(long long a, long long b) { return !b ? a : gcd(b, a % b); }
long long lcm(long long a, long long b) { return (a / gcd(a, b)) * b; }
long long power(unsigned long long a, unsigned long long b,
                unsigned long long ret = 1LL) {
  while (b--) ret = (ret * a);
  return ret;
}
int main() {
  int x, y, z;
  cin >> x >> y >> z;
  if (x + z > y && x > y + z) {
    cout << "+";
  } else if (y + z > x && y > x + z) {
    cout << "-";
  } else if ((x + z == y && x == y + z) || (y + z == x && y == x + z)) {
    cout << "0";
  } else {
    cout << "?";
  }
}
