import java.util.*;
import java.lang.*;
import java.io.*;
import java.util.regex.*;
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
		String s = "::a:b?:c??::d???????:e::";
		Pattern pattern = Pattern.compile("(?>\\?.|[^:?])+|(?<=:)(?=:)");
		Matcher matcher = pattern.matcher(s);
		while (matcher.find()){
			System.out.println("'" + matcher.group() + "'"); 
		} 
	}
}