Code Viblo

Code Viblo Huy Chat Pro 

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import sys

count = 0
number_of_people = 0

for line in sys.stdin:
    if line[0] == '+':
        number_of_people += 1
    elif line[0] == '-':
        number_of_people -=1
    else:
        # print(line.split(':')[1])
        # print(len(line.split(':')[1]))
        # print(number_of_people)
        index_colon = line.find(':')
        line = line[index_colon:]
        s = line.rstrip().lstrip()
        if s != ':':
            count += (len(s)) * number_of_people

print(count)