#include<stdio.h>
#include<stdlib.h>

typedef struct L {
	char letter ;
	struct L *next ;
} List ;				//defines structure for list

typedef struct LL {
	List *word ;
	struct LL *next ;
} ListofList ;			//defines structure for list of lists

List *insertList(char inputLetter, List *word) 			//construction of a list
{
	List *Sentence = calloc( 1, sizeof( List ) ) ;
	Sentence-> letter = inputLetter ;
	Sentence-> next = word ;
	return Sentence ;
}

ListofList *insertListofList(List *word, ListofList *inputSentence)		//construction of list of lists
{
	ListofList *Sentence = calloc (1, sizeof(ListofList)) ;
	Sentence->word = word ;
	Sentence->next = inputSentence ;
	return Sentence ;
}

List *addList( char inputLetter, List *word ) 		//adding letters at the end of the list
{
	if( word == NULL )
	{
		return insertList( inputLetter, NULL ) ;
	}
	else
	{
		List *w ;
		for( w = word ; w->next != NULL ; w = w->next )
		{
		}
		w->next = insertList( inputLetter, NULL ) ;
		return word ;
	}
}

ListofList *read (void)		//reading all the input
{
	char inputLetter2 ;
	ListofList *sentence = NULL ;
	while (inputLetter2 != '.')
	{
		char inputLetter = '0';
		List *word =NULL ;
		while (inputLetter != '\n')
		{
			inputLetter = getchar() ;
			if (inputLetter =='.')
			{
				inputLetter = '\n' ;
				inputLetter2 = '.' ;
			}
			word = addList(inputLetter, word) ;
		}
		sentence = insertListofList(word, sentence) ;
	}
	return sentence ;
}

int main( void )
{
	char print ;
	ListofList *output = read() ;
	while (output != NULL)
	{
		print = putchar (output ->word -> letter) ;
		output->word = output->word-> next ;
		if (output->word == NULL)
		{
			output = output->next ;
		}
	}
	return 0 ;
}