using System;

using System.Text.RegularExpressions;

using System.Collections.Generic;

public class MatchNumbers

{

    public static void Main()

    {

        string regex = @"(^|(?<=\s))-?\d+(\.\d+)?($|(?=\s))";

        List<Match> matchesToPrint = new List<Match>();

        var lineNumbers = Console.ReadLine();

        var matchedNumbers = Regex.Matches(lineNumbers, regex);

        foreach (Match number in matchedNumbers)

        {

            matchesToPrint.Add(number);

        }

        Console.WriteLine(string.Join(" ", matchesToPrint));

    }

}