from sys import *

argv = argv[1:]
if len(argv) != 3:
    print "usage: join-data <mean.data> <std.data> <output.data>"
    exit(2)

meanFilename = argv[0]
stdFilename = argv[1]
outputFilename = argv[2]

mean = open(meanFilename, 'r')
std = open(stdFilename, 'r')
out = open(outputFilename, 'w')
n = 0
for mline in mean:
    mline = mline.strip()
    sline = std.readline().strip()
    out.write("%d %s %s\n" % (n, mline, sline))
    n += 1
out.close()