string = input()

podxodat = 0

def gen_all_pidradki():
    allPidradkii = set()
    for i in range(len(string)):
        for j in range(len(string), i, -1):
            allPidradkii.add(string[i:j:1])
    return allPidradkii

def gen_all_pidradki_2(txt, start):
    allPidradkii = []
    while start <= len(txt):
        for i in range(0, len(txt)):
            if i <= len(txt) - start:
                allPidradkii.append(txt[i:i + start])
        start = start + 1
    return allPidradkii


allPidradki = gen_all_pidradki_2(string, 3)


for i in allPidradki:
    odinak = 0
    maxOdinak = 0
    for j in range(len(i)):
        odinak = 0
        for sravn in range(len(i)):
            if i[j] == i[sravn]:
                odinak += 1
                if odinak > maxOdinak:
                    maxOdinak = odinak
    if maxOdinak == (len(i) - 1):
        podxodat += 1

print(podxodat)