mission idea "Ancient Letters"

I made a simple decryption mission with reference to Egyptian hieroglyphs.

Please decrypt the input string using the dictionary.

note:

• Leftmost longest matching rule (e.g. 'lllll' == 'yyi')
• ',' indicates the delimiter (e.g. 'l,ll' == 'iy')
• Characters that do not match the dictionary are output as is.

I would like to get a feedback about this idea.

sample of initial code:

HIERO_DIC = {
    r'|\.': 'a',
    '_|': 'b',
    '_=': 'd',
    'v_': 'f',
    'A': 'g',
    '8': 'h',
    'l': 'i',
    '^\_': 'j',
    'up': 'k',
    '_@=_': 'l',
    r'^|\.': 'm',
    '~~': 'n',
    'o~)': 'o',
    '[]': 'p',
    '/|': 'q',
    '()': 'r',
    'n': 's',
    '(|': 't',
    '@': 'w',
    'll': 'y',
    '-+-': 'z',
}

def ancient_letters(input_string):
    return ''

if __name__ == '__main__':
    assert ancient_letters(r'c8ecuplo~)') == 'checkio', 'checkio'
    assert ancient_letters(r'l _@=_o~)ve []ll(|8o~)~~') == 'i love python', 'i love python'
    assert ancient_letters(r'lll,l,ll') == 'yiiy', 'yiiy'