Anagram - declare a string using alphabetic chars - 26 chars

Anagram2.java

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution {

	public static int solve(String a, String b) {
		if (a.length() != b.length()) {return -1;}
		String alph = "abcdefghijklmnopqrstuvwxyz";
		char[] ac = a.toCharArray();
		char[] bc = b.toCharArray();
		int[] counts = new int[26];
		for (int i = 0; i < ac.length; i++) {
			counts[alph.indexOf(ac[i])]++;
			counts[alph.indexOf(bc[i])]--;
		}
		
		int answer = 0;
		for (int i = 0; i < counts.length; i++) {
			if (counts[i] > 0) {answer+=counts[i];}
		}
		return answer;		
	}
	
	public static void main(String[] args) {
		Scanner in = new Scanner(System.in);
		int tests = in.nextInt();
        in.nextLine();
		
		for (int i = 0; i < tests; i++) {
			String next = in.nextLine();
			System.out.println(solve(next.substring(0, next.length() / 2), next.substring(next.length() / 2, next.length())));
		}
	}

}