using AtCoderBeginnerContest123.Questions;
using AtCoderBeginnerContest123.Extensions;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;

namespace AtCoderBeginnerContest123.Questions
{
    public class QuestionD : AtCoderQuestionBase
    {
        public override IEnumerable<object> Solve(TextReader inputStream)
        {
            var xyzk = inputStream.ReadIntArray();
            var k = xyzk[3];

            var a = inputStream.ReadLongArray();
            var b = inputStream.ReadLongArray();
            var c = inputStream.ReadLongArray();

            var orderedAB = a.SelectMany(x => b.Select(y => x + y)).ToArray();
            Array.Sort(orderedAB);
            Array.Reverse(orderedAB);
            var orderedABC = orderedAB.Take(k).SelectMany(ab => c.Select(z => ab + z)).ToArray();
            Array.Sort(orderedABC);
            Array.Reverse(orderedABC);

            foreach (var abc in orderedABC.Take(k))
            {
                yield return abc;
            }
        }

        struct SumAndCount : IComparable<SumAndCount>
        {
            public long Sum { get; }
            public int Count { get; }

            public SumAndCount(long sum, int count)
            {
                Sum = sum;
                Count = count;
            }

            public int CompareTo(SumAndCount other) => Sum.CompareTo(other.Sum);

            public override string ToString() => $"Sum:{Sum}, Count:{Count}";
        }
    }
}


namespace AtCoderBeginnerContest123
{
    class Program
    {
        static void Main(string[] args)
        {
            IAtCoderQuestion question = new QuestionD();    // 問題に合わせて書き換え
            var answers = question.Solve(Console.In);
            foreach (var answer in answers)
            {
                Console.WriteLine(answer);
            }
        }
    }
}

#region Base Classes

namespace AtCoderBeginnerContest123.Questions
{

    public interface IAtCoderQuestion
    {
        IEnumerable<object> Solve(string input);
        IEnumerable<object> Solve(TextReader inputStream);
    }

    public abstract class AtCoderQuestionBase : IAtCoderQuestion
    {
        public IEnumerable<object> Solve(string input)
        {
            var stream = new MemoryStream(Encoding.Unicode.GetBytes(input));
            var reader = new StreamReader(stream, Encoding.Unicode);

            return Solve(reader);
        }

        public abstract IEnumerable<object> Solve(TextReader inputStream);
    }

}

#endregion

#region Extensions

namespace AtCoderBeginnerContest123.Extensions
{
    internal static class TextReaderExtensions
    {
        internal static int ReadInt(this TextReader reader) => int.Parse(ReadString(reader));
        internal static long ReadLong(this TextReader reader) => long.Parse(ReadString(reader));
        internal static double ReadDouble(this TextReader reader) => double.Parse(ReadString(reader));
        internal static string ReadString(this TextReader reader) => reader.ReadLine();

        internal static int[] ReadIntArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(int.Parse).ToArray();
        internal static long[] ReadLongArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(long.Parse).ToArray();
        internal static double[] ReadDoubleArray(this TextReader reader, char separator = ' ') => ReadStringArray(reader, separator).Select(double.Parse).ToArray();
        internal static string[] ReadStringArray(this TextReader reader, char separator = ' ') => reader.ReadLine().Split(separator);
    }
}

#endregion

Measured memory_bytes: 70656