S = input()
num = 1


def get_n(s):
    global num
    for idx in range(len(s)):
        if len(s) <= 1 or idx + 1 > len(s) // 2:
            return
        if s[idx] == s[len(s) - 1]:
            if s[:idx + 1] == s[len(s) - idx - 1:]:
                num += 1
                get_n(s[idx + 1:len(s) - idx - 1])


get_n(S)
print(num)