package main

import (
	"bufio"
	"fmt"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}

var m map[pair]int

func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	s := getNextString(scanner)
	n := len(s)
	var ans int
	m = map[pair]int{}
	m[pair{0, 1}] = 1

	for i := 1; i < n; i++ {
		ans = max(ans, max(maxlength(0, i, s), maxlength(i, n, s)))
	}
	fmt.Fprintln(writer, ans)
}

type pair [2]int

func ismirror(s string) bool {
	n := len(s)
	for i := 0; i < n/2; i++ {
		if s[i] != s[n-1-i] {
			return false
		}
	}
	return true
}
func maxlength(l, r int, s string) int {
	if m[pair{l, r}] > 0 {
		return m[pair{l, r}]
	}
	if ismirror(s[l:r]) {
		m[pair{l, r}] = r - l
		return r - l
	}
	var ans int
	for i := l + 1; i < r; i++ {
		lmax := maxlength(l, i, s)
		rmax := maxlength(i, r, s)
		ans = max(ans, max(lmax, rmax))
	}

	m[pair{l, r}] = ans
	return ans
}
func max(a, b int) int {
	if a < b {
		return b
	}
	return a
}