#!/usr/bin/env python

import sys
import os
import six

def inc_text(s):
	if not s.startswith( '@' ):
		return None
	path = s[ 1: ]

	r = False
	if not os.path.exists( path ):
		return r

	with open( path, 'rb' ) as f:
		try:
			r = f.read().decode( 'utf-8' )
			if r[ -1 ] == '\n':
				r = r[ : -1 ]
			return ( r, path ) #  !
		except:
			pass
	return r

paths = [ '-' ]

def err(s, i):
	sys.stderr.write( 'err {}, {} L{}\n'.format( s, paths[ -1 ], i+1 ) )
	sys.exit( 1 )

def inc_exp(s, inc_text):

	def inc_exp_line(i_s):
		(i, s) = i_s
		r = inc_text( s )
		if r == False:
			err( s, i )
		if r == None:
			return s
		(s, path) = r
		if path in paths:
			return ''  # !
		paths.append( path )
		s = inc_exp( s, inc_text )
		paths.pop()
		return s

	return '\n'.join( map( inc_exp_line, enumerate( s.split( '\n' ) ) ) )

if __name__ == "__main__":
	f = sys.stdin if six.PY2 else sys.stdin.buffer
	s = f.read().decode( 'utf-8' )

	s = inc_exp( s, inc_text )

	f = sys.stdout if six.PY2 else sys.stdout.buffer
	f.write( s.encode( 'utf-8' ) )
# EOF