Hello, why is my code wrong according to the test? When I run it works correctly. Thank you. 
package com.codegym.task.task07.task0721;

import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;

/*
Min and max in arrays

*/

public class Solution {
    public static void main(String[] args) throws IOException {
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));

        int minimum;
        int maximum;


        //write your code here
        int[] listArray = new int[20];

        for (int i = 0; i < 20; i++) {
            listArray[i]=(Integer.parseInt(reader.readLine()));
        }

         maximum = listArray[0];
         minimum = listArray[0];

        for (int i = 0; i < listArray.length - 1; i++) {
            if (listArray[i] < minimum) {
                minimum = listArray[i];
            }
            if (listArray[i] > maximum) {
                maximum = listArray[i];
            }
        }

        System.out.print(maximum + " " + minimum);
    }
}