#!/usr/bin/python
import sys

def process(val_):
    try:
        f = open(val_,"r+")
    except IOError:
        print "Error! no such file"
        sys.exit()
    f.seek(0,2)
    f.write('\n')
    f.close()

if __name__ == '__main__':
    try:
        val = sys.argv[1]
    except IndexError:
        print "Error! no argumnet"
        sys.exit()
    process(val)