#include <iostream>
	#include <sstream>
	#include <vector>
	#include <set>
	#include <tuple>
 
	int main()
	{
		std::string line;
		while(getline(std::cin, line))
		{
			std::stringstream ss(line);
			std::multiset<int> mset;
			int n;
			while(ss >> n)
				mset.insert(n);
 
			std::set<std::tuple<int, int, int>> triplets;
			const std::vector<int> numbers(mset.begin(), mset.end());
			for(size_t i = 0; i < numbers.size() - 3; i++)
			{
				size_t start = i + 1, end = numbers.size() - 1;
				while(start < end)
				{
					int sum = numbers[i] + numbers[start] + numbers[end];
					if(sum == 0)
					{
						triplets.insert(std::make_tuple(numbers[i], numbers[start], numbers[end]));
						end--;
						continue;
					}
					sum > 0 ? end-- : start++;
				}
			}
 
			for(const auto& t: triplets)
			{
				std::cout << std::get<0>(t) << ' ';
				std::cout << std::get<1>(t) << ' ';
				std::cout << std::get<2>(t) << std::endl;
			}
			std::cout << std::endl;
		}
		return 0;
	}

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

OSAtNiAtNSA5IDggMyAtNCA4IDEgNyAtNCA5IC05IDEgOSAtOSA5IDQgLTYgLTgKCTQgNSAtMSAtMiAtNyAyIC01IC0zIC03IC0zIDEKCS0xIC02IC0zIC03IDUgLTggMiAtOCAxCgktNSAtMSAtNCAyIDkgLTkgLTYgLTEgLTc=

9 -6 -5 9 8 3 -4 8 1 7 -4 9 -9 1 9 -9 9 4 -6 -8
	4 5 -1 -2 -7 2 -5 -3 -7 -3 1
	-1 -6 -3 -7 5 -8 2 -8 1
	-5 -1 -4 2 9 -9 -6 -1 -7