from lib import LETTERS_LOWER


def part_1(data):
    data = data.strip()
    i = 0
    while i < (len(data) - 1):
        a, b = data[i], data[i + 1]
        if (a.upper() == b.upper()) and (a != b):
            data = data[:i] + data[i + 2 :]
            i = max(0, i - 1)
        else:
            i += 1
    print(len(data))


def part_2(data):
    data_orig = data.strip()
    min_len = float("inf")
    for c in LETTERS_LOWER:
        data = str(data_orig)
        data = data.replace(c, "")
        data = data.replace(c.upper(), "")
        i = 0
        while i < (len(data) - 1):
            a, b = data[i], data[i + 1]
            if (a.upper() == b.upper()) and (a != b):
                data = data[:i] + data[i + 2 :]
                i = max(0, i - 1)
            else:
                i += 1

        min_len = min(min_len, len(data))
    print(min_len)


def main():
    input_file = __file__.replace(".py", ".txt")
    with open(input_file) as f:
        data = f.read()
    part_1(data)
    part_2(data)


if __name__ == "__main__":
    main()