Balanced String O(n)

import java.util.Scanner;

class Balanced_String{
    public static void main(String[] args){
        Scanner scanner = new Scanner(System.in);
        boolean checker;
        while(scanner.hasNext()){
            checker = true;
            String input = scanner.next();
            for (int i = 0, j = input.length()-1; i<j; i++, j--) {
                if(input.charAt(i) != input.charAt(j)){
                    checker = false;
                    break;
                }
            }
            System.out.println(checker);
        }
        scanner.close();
    }
}