Update - solution checker still not working. Python 3. Anybody read these?

Update - solution checker still not working. C and Python 3. Anybody read these?

Solution checker not working, but even if it did I still have no idea how it could do the decoding, given that it is esplicitely asked to provide only 17-bit codes for words and avoid 8-bit codes for single alpha-nuemeric and special characters....

strings = []
start = None
end = None

for _ in range(1000000):
    try:
        line = input()
        for i,c in enumerate(line):
            if c.isalnum() and start is None:
                start = i
            if not c.isalnum():
                strings.append(c)
                if start is not None:
                    end = i
                    strings.append(line[start:end])
                    start = None
    except EOFError:
        break

d = {}
ix = 2**9
for i,s in enumerate(set(strings)):
    if len(s) == 1:
        b = bin(ord(s))[2:]
        b = ''.join(['0']*(8-len(b))) + b
        d[s] = b
    if len(s) > 1:
        b = bin(ix)[2:]
        b = '1' + ''.join(['0']*(16-len(b))) + b
        ix += 1
        d[s] = b    

print(str(ix-2**9))

for k,v in d.items():
    if len(k)>1:
        print(k + '\t' + v)
        
encoded = ''
for s in strings:
    if len(s)>0:
        encoded += d[s]
print(encoded)
    

Checker is still broken (17 Nov. 2019) Please fix!?!!?

The program that checks the encoding is faulty (see output):

File "/custom-bq2VgBPyqygWVeh9pvf8/solution.py", line 58, in unpack n = int(lines[0]) ValueError: invalid literal for int() with base 10: "The Project Gutenberg's Etext of Shakespeare's First Folio

It reads the original text where it was expecting an integer (the only expected integer is the number of 17-bit codes on the first line of the output). I seems that the input to the checker is not the output of my program, but the original text. It is a problem of either miss-alignment, or even reading order being changed. None of the sample cases nor the test cases pass, although I have checked my program and satisfies the problem specifications.