import re

with open("manager.txt") as f:
    content = f.readlines()
# you may also want to remove whitespace characters like `\n` at the end of each line
content = [x.rstrip('\n;') for x in content]
freqCnt = {}
for line in content:
    m = re.compile("(.*)manager (P.*)").match(line)
    if m is not None:
        managers = m.group(2).split(" or ")
        print managers
        for oneManager in managers:
            freqCnt[oneManager] = freqCnt.get(oneManager, 0) + 1

byFreq = sorted(freqCnt, key=freqCnt.get, reverse=True)
for manager in byFreq:
    print manager + ': ' + str(freqCnt[manager])