input_file = r"C:\\Users\esf\Desktop\ExcelviaPython\AsReceived.txt"
output_file = r"C:\\Users\esf\Desktop\ExcelviaPython\UniqueValues.txt"

with open(input_file) as in_file:
    counter = 0

    ListIncludingDupes = []
    UniqueList = []
    for line in in_file.readlines():

        numsemicolons = line.count(";")

        if numsemicolons == 0:
            ListIncludingDupes.append(line)
        else:
            linelist = line.split(";")
            for line_element in linelist:
                line_element.strip()
                ListIncludingDupes.append(line_element)


        for potential_unique in ListIncludingDupes:
            if potential_unique == '\n':
                continue
            elif potential_unique.strip() not in UniqueList:
                UniqueList.append(potential_unique.strip())
            else:
                continue



with open(output_file, "a") as out_file:
    UniqueList.sort()
    for value in UniqueList:
        out_file.write('%s\n' % value)