S = input().rstrip()
L = len(S)

isPal = [[False]*L for _ in range(L)]
for i in range(L) :
    isPal[i][i] = True
    if i != 0 and S[i] == S[i-1] :
        isPal[i-1][i] = True

for l in range(3, L+1) :
    for start in range(L-l+1) :
        end = start + l - 1
        
        if S[start] == S[end] and isPal[start+1][end-1] :
            isPal[start][end] = True

dp = [L+1] * L

for end in range(l) :
    for start in range(end+1) :
        if isPal[start][end] :
            if start == 0 :
                dp[end] = 1
            else :
                dp[end] = min(dp[end], dp[start-1] + 1)

print(dp[L-1])