/* package whatever; // don't place package name! */
 
import java.util.*;
import java.lang.*;
import java.io.*;
 
/* Name of the class has to be "Main" only if the class is public. */
class Ideone
{
        public static int longestPalindrome(String s) {
        int[] count = new int[128];
        for (char c: s.toCharArray())
            count[c]++;
 
        int ans = 0;
        for (int v: count) {
            ans += v / 2 * 2;
            if (ans % 2 == 0 && v % 2 == 1)
                ans++;
        }
        return ans;
    }
 
	public static void main (String[] args) throws java.lang.Exception
	{
		// your code goes here
		System.out.println("The length of longest palindrome is:- " + longestPalindrome("abccccdd"));
	}
}

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