import sys

sys.setrecursionlimit(10**7)
def I(): return int(sys.stdin.readline().rstrip())
def MI(): return map(int,sys.stdin.readline().rstrip().split())
def LI(): return list(map(int,sys.stdin.readline().rstrip().split()))
def LI2(): return list(map(int,sys.stdin.readline().rstrip()))
def S(): return sys.stdin.readline().rstrip()
def LS(): return list(sys.stdin.readline().rstrip().split())
def LS2(): return list(sys.stdin.readline().rstrip())


S = S()
N = len(S)
if N % 2 == 1:
    S = S[:N//2]+S[N//2+1:]
    N -= 1

ord_S = [ord(s)-96 for s in S]
mod = 10**9+7
r = 1234

H = [[0]*N for _ in range(N)]  # H[i][j] = S[i:j+1]のRolling Hash
for i in range(N):
    h = 0
    for j in range(i,N):
        h *= r
        h += ord_S[j]
        h %= mod
        H[i][j] = h

dp = [0]*(N//2+1)  # dp[i] = S[i:N-i]に対する答え
dp[-1] = 1
for i in range(N//2-1,-1,-1):
    x = 1
    for j in range(i,N//2):
        if H[i][j] == H[N-1-j][N-1-i]:
            x += dp[j+1]
            x %= mod
    dp[i] = x

ans = dp[0]
print(ans)