#include <bits/stdc++.h>
#pragma comment(linker, "/stack:200000000")
#pragma GCC optimize("Ofast")
#pragma GCC target("sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,tune=native")
using namespace std;
long long int mod = 1e9 + 7;
long long int mod1 = 1e9 + 5;
long long int power(long long int a, long long int b) {
  if (b == 0)
    return 1;
  else if (b % 2 == 0)
    return power(a * a % mod, b / 2) % mod;
  else
    return (a % mod * power(a * a % mod, b / 2)) % mod;
}
long long int bit(long long int x) { return __builtin_popcountll(x); }
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  long long int a, b, c;
  cin >> a >> b >> c;
  if (a > b + c) {
    cout << "+";
    return 0;
  } else if (b > a + c) {
    cout << "-";
    return 0;
  } else if (b == a && c == 0) {
    cout << "0";
    return 0;
  } else
    cout << "?";
}
