import sys

num = 0
with open(sys.argv[1], 'rb') as f:
    while True:
        chunk = f.read(1024 * 1024 * 5)
        if len(chunk) < 1024 * 1024 * 5:
            break
        num += 1
        print num
        seq = []
        for b in chunk:
            o = ord(b)
            if 32 <= o <= 122:
                seq.append(b)
            else:
                if len(seq) >= 20:
                    print ''.join(seq)
                seq = []