#include <bits/stdc++.h>
using namespace std;
int main() {
  long long int x, y, z, temp;
  cin >> x >> y >> z;
  temp = x - y;
  if (temp < 0) {
    if (temp + z >= 0)
      cout << "?";
    else if (temp < 0)
      cout << "-";
  } else if (temp > 0) {
    if (temp - z <= 0)
      cout << "?";
    else if (temp > 0)
      cout << "+";
  } else if (temp == 0) {
    if (temp - z != 0)
      cout << "?";
    else
      cout << "0";
  }
}
