Is Array in Wave Form - Alpha 56 Java Programming Fundamentals

package Tasks_04_Arrays;

import java.util.Scanner;

public class Hw_04_06_IsArrayInWaveForm {
    public static void main(String[] args) {

        Scanner scanner = new Scanner(System.in);

        String[] input = scanner.nextLine().split(" ");
        int[] numbers = new int[input.length];
        int counter = 0;
        boolean isPrint = false;

        for (int i = 0; i < input.length; i++) {
            numbers[i] = Integer.parseInt(input[i]);
        }

        if (numbers.length % 2 != 0) {
            for (int i = 1; i < input.length; i += 2) {
                if (numbers[i] < numbers[i - 1] && numbers[i] < numbers[i + 1]) {
                    counter++;
                }
            }

            if (numbers.length / 2 == counter) {
                isPrint = true;
            }

        } else {
            for (int i = 1; i < numbers.length; i += 2) {
                if (i == numbers.length - 1 && numbers[i] < numbers[i - 1]) {
                    counter++;
                } else if (numbers[i] < numbers[i - 1] && numbers[i] < numbers[i + 1]) {
                    counter++;
                }
            }

            if (numbers.length / 2 == counter) {
                isPrint = true;
            }

        }

        if (isPrint){
            System.out.println("yes");
        } else {
            System.out.println("no");
        }

    }
}