import csv

if __name__ == '__main__':

pairs = {}

with open('francejs.csv', 'r', newline='') as csvfile:

reader = csv.reader(csvfile, delimiter=',', quotechar='"')

msg_logs = [row for row in reader if row[0] == '1']

usernames = [log[2] for log in msg_logs]

for log in msg_logs:

for username in usernames:

if username in log[3]:

pair_name = (log[2], username) if log[2] < username else (username, log[2])

if pair_name in pairs.keys():

pairs[pair_name] += 1

else:

pairs[pair_name] = 1

pairs = sorted(pairs, key=lambda x:x[1], reverse=False)

print(pairs[0][0] + ", " + pairs[0][1])