import sys
sys.setrecursionlimit(10000)
S = input()
num = 1
nums = {}


def get_n(s):
    global num
    if s and s.count(s[0]) == len(s):
        num += 2 ** (len(s) // 2) - 1
        nums[s] = 2 ** (len(s) // 2) - 1
        return
    if nums.get(s):
        num += nums[s]
        return
    start_num = num
    for idx in range(len(s)):
        if len(s) <= 1 or idx + 1 > len(s) // 2:
            nums[s] = num - start_num
            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 % 1000000007)