#!/usr/bin/python3
import json
import sys
def inputs(args):
if args:
for filename in args:
with open(filename) as f:
yield filename, f
else:
yield "-", sys.stdin
objs = []
for filename, f in inputs(sys.argv[1:]):
objs.append(json.load(f))
json.dump(objs, sys.stdout, indent=4)
sys.stdout.write("\n")