#include <bits/stdc++.h>

[[nodiscard]] static inline constexpr int_fast32_t solve(const uint_fast32_t N) noexcept
{
	if (std::popcount(N) <= 1) [[unlikely]] return -1;

	uint_fast32_t i = 1;
	for (i = 1; std::popcount(N & ((UINT32_C(1) << i) - 1)) < 2; ++i);
	return (UINT32_C(1) << i) - (N & ((UINT32_C(1) << i) - 1));
}

int main()
{
	std::cin.tie(nullptr);
	std::ios::sync_with_stdio(false);
	
	uint_fast32_t T;
	std::cin >> T;
	for (uint_fast32_t i = 0; i != T; ++i)
	{
		uint_fast32_t N;
		std::cin >> N;
		std::cout << solve(N) << '\n';
	}

	return 0;
}