#Write a program to read through the mbox-short.txt and figure out who has sent the greatest number of mail messages.

#The program looks for 'From ' lines and takes the second word of those lines as the person who sent the mail.

#The program creates a Python dictionary that maps the sender's mail address to a count of the number of times they appear in the file.

#After the dictionary is produced, the program reads through the dictionary using a maximum loop to find the most prolific committer.

name = input("Enter file:")

if len(name) < 1 : name = "mbox-short.txt"

handle = open(name)

lst=list()

for line in handle:

if not line.startswith('From:'):continue

line=line.split()

list.append(line[1])

counts=dict()

for word in lst:

counts[word]=counts.get(word,0)+1

bigcount=None

bigword=None

for word,count in counts.items():

if bigcount is None or count > bigcount:

bigcount=count

bigword=word

print(bigword,bigcount)