#!/usr/bin/python3
"Convert .vtt files from youtube-dl into plain text."
import sys, re

tag = re.compile(r'<[^>]*>')

def main(infile):
    #seen = set()
    lastline = None
    for line in infile:
        line = line.strip()
        if not line or ' --> ' in line:
            continue
        line = tag.sub('', line)
        if line == lastline:
            continue

        lastline = line
        #seen.add(line)

        assert isinstance(line, str), line
        yield line
        yield '\n'

if __name__ == '__main__':
    sys.stdout.writelines(main(sys.stdin))