from lib import *

data = open(0).read().strip()
first = False

def has_abba(xs):
    for i in range(len(xs) - 3):
        if xs[i] == xs[i + 3] and xs[i + 1] == xs[i + 2] and xs[i] != xs[i + 1]:
            return True
    return False

if first:
    r = 0
    for line in data.splitlines():
        is_abba = False

        xs = ""
        for c in line:
            if c == "[":
                if has_abba(xs):
                    is_abba = True
                xs = ""
            elif c == "]":
                if has_abba(xs):
                    is_abba = False
                    xs = ""
                    break
                xs = ""
            xs += c

        if xs != "" and has_abba(xs):
            is_abba = True

        if is_abba:
            r += 1
    print(r)
else:
    def abas(xs) -> set:
        r = set()
        for i in range(len(xs) - 2):
            if not in_square and xs[i] == xs[i + 2] and xs[i] != xs[i + 1]:
                r.add(xs[i:i+3])
        return r

    def babs(xs) -> set:
        r = set()
        for i in range(len(xs) - 2):
            if not in_square and xs[i] == xs[i + 2] and xs[i] != xs[i + 1]:
                r.add(xs[i + 1] + xs[i] + xs[i + 1])
        return r

    r = 0
    for line in data.splitlines():
        aba, bab = set(), set()
        in_square = False
        xs = ""
        for c in line:
            if c == "[":
                aba |= abas(xs)
                xs = ""
            elif c == "]":
                bab |= babs(xs)
                xs = ""
            else:
                xs += c
        if xs != "":
            aba |= abas(xs)

        if aba & bab:
            r += 1

    print(r)