##################################
#                                #
# Last modified 3/10/2010        # 
#                                #
# Georgi Marinov                 #
#                                # 
##################################

import sys

try:
	import psyco
	psyco.full()
except:
	pass

def run():

    if len(sys.argv) < 1:
        print 'usage: python %s inputfilename' % sys.argv[0]
        sys.exit(1)

    inputfilename = sys.argv[1]
    outputfilename = inputfilename.split('.bed')[0]+'.bed4.bed'

    outfile = open(outputfilename, 'w')

    lineslist = open(inputfilename)
    i=0
    for line in lineslist:
        i+=1
        if line[0:3]!='chr':
            continue
        if i % 1000000 == 0:
            print i, 'lines processed'
        fields = line.strip().split('\t')
        outline= fields[0]+'\t'+fields[1]+'\t'+fields[2]+'\t'+fields[3]+'\n'
        outfile.write(outline)
    outfile.close()

run()