fq

#!/usr/bin/env python

import sys
import json
from collections import OrderedDict

opts = {
        'format' : 'txt',
        'keys' : sys.argv[1:]
        }

def json_select(line, keys):
    kv = json.loads(line)
    if not keys:
        return kv
    return OrderedDict([(k, kv.get(k)) for k in keys if k in kv])

def process(line, keys):
    try:
        kv = json_select(line, keys)
        if kv:
            output(kv)
    except ValueError:
        pass

def output(kv):
    if opts['format'] == 'json':
        print json.dumps(kv, indent=4)
    elif opts['format'] == 'txt':
        print " ".join([str(x) for x in kv.values()])

for line in sys.stdin:
    keys = [x.decode('UTF-8') for x in opts['keys']]
    process(line, keys)

sys.exit(0)