addParam("txt", txt)
result = False
if(None, None, 'txt == "" or txt == None')
    result = False
else()
    replace(txt, ",", " ", txt_clean)
    last_word = txt_clean.split()[-1] if txt_clean.split() else ""
    getListLen(last_word, last_len)
    if(None, None, 'last_len == 1 and last_word.lower() >= "a" and last_word.lower() <= "z"')
        result = True
    else()
        result = False
    end()
end()
addResult(result)
_status = 200