import sys
input = lambda : sys.stdin.readline().rstrip()

write = lambda x: sys.stdout.write(x+"\n")
debug = lambda x: sys.stderr.write(x+"\n")
writef = lambda x: print("{:.12f}".format(x))

def sub(s):
    s = [ord(c) for c in s]
    b = 128
    cum = [0]
    v = 1
    for i in range(len(s)):
        v *= b
        v %= M
        cum.append(cum[-1] + v*s[i]%M)
    bs = [1]
    for _ in range(len(s)+10):
        bs.append(bs[-1]*b%M)
    n = len(s)
    m = (n)//2 + 1
    dp = [0]*(m)
    dp[0] = 1
    for i in range(1,m):
        val = 0
        for j in range(i):
#             if s[j:i]==s[n-i:n-j]:
            if ((cum[i]-cum[j])*bs[n-j-i]%M == (cum[n-j]-cum[n-i])%M):
                val += dp[j]
                if val>M:
                    val -= M
        dp[i] = val%M
    return sum(dp)
M = 10**9+7
s = input()
ans = sub(s)
print(ans%M)