#!/usr/bin/python3

import sys, re

pair_pattern = re.compile("# Sentence pair \((\d+)\)")


def getNextSentencePair(pairs_file):
    first_line = pairs_file['file'].readline()
    if first_line == '':
        # we reached the end of file
        pairs_file['nextPair'] = None
    else:
        nextPair = dict()
        m = pair_pattern.match(first_line)
        if m:
            nextPair['number'] = int(m.group(1))
        else:
            raise Exception("Could not read sentence pair number from line: %s" %first_line)
        lines = [first_line]
        lines.append(pairs_file['file'].readline())
        lines.append(pairs_file['file'].readline())
        nextPair['lines'] = lines
        pairs_file['nextPair'] = nextPair

files = []
for arg in sys.argv[1:]:
    pairs_file = {'file':open(arg,'r'), 'nextPair':None}
    getNextSentencePair(pairs_file)
    files.append(pairs_file)

finished = False
while not finished:
    youngest_file = None
    for pairs_file in files:
        if pairs_file['nextPair'] is not None:
        # if the file is not at end
            if youngest_file is None or pairs_file['nextPair']['number'] < youngest_file['nextPair']['number']:
                youngest_file = pairs_file
    if youngest_file is None:
        finished = True
    else:
        print(''.join(youngest_file['nextPair']['lines']).rstrip())
        getNextSentencePair(youngest_file)



for pairs_file in files:
    pairs_file['file'].close()

"""

i = 0
for line in sys.stdin:
    line = line.strip()
    if i % 3 == 0:
        current_example = [line]
        m = p.match(line)
        if m:
            current_key = int(m.group(1))
        else:
            raise Exception("Wrong line: "+line)
    elif i % 3 == 1:
        current_example.append(line)
    else:
        current_example.append(line)
        examples_dict[current_key] = current_example
    i+=1

for key in sorted(examples_dict.keys()):
    print ('\n'.join(examples_dict[key]))
"""