#!/usr/bin/python2.7

def parse_row(s):
    row = []
    qe = qp = None
    for s in s.replace('\r','').replace('\n','').split(' '):
        if qp:
            qp.append(s)
        elif '' == s:
            row.append('')
        elif '"' == s[0]:
            qp = [ s ]
            qe = '"'
        elif '[' == s[0]:
            qp = [ s ]
            qe = ']'
        else:
            row.append(s)

        l = len(s)
        if l and qe == s[-1]:
            if l == 1 or s[-2] != '\\':
                row.append(' '.join(qp)[1:-1].replace('\\'+qe, qe))
                qp = qe = None
    return row

ip = {}
ip_404 = {}
hours = [0] * 24

with open('web-access.log') as f:
    for line in f:
        req = parse_row(line)
        addr = req[0]
        status = req[4]
        hour = int(req[2].split(":")[1])

        ip[addr] = ip.get(addr, 0) + 1

        if status == '404':
            ip_404[addr] = ip_404.get(addr, 0) + 1

        hours[hour] = hours[hour] + 1

ip = sorted(ip, key=ip.get, reverse=True)
ip_404 = sorted(ip_404, key=ip_404.get, reverse=True)

max_req = hours[0]
max_hour = 0
for i in range (0, 24):
    if hours[i] > max_req:
        max_req = hours[i]
        max_hour = i

print "1) TOP-5 IP-addresses:"
for i in range(0, 5):
    print ip[i]

print "2) Most frequent 404 IP-address:"
print ip_404[0]

print "3) The most active hour:"
print max_hour