This is a terrible question and should be removed. You don't need to use any part of the supplied code and can just print out the value of n nextInt() to satisfy all tests.

import java.util.*;

public class Solution1{

public static void main(String args[]){

    Scanner scan=new Scanner(System.in);

    int size=scan.nextInt();

    int a[]=new int[size];

    for(int i=0;i<size;i++){

        a[i]=scan.nextInt();
    }
    for(int i=0;i<a.length;i++){

        if(i==a.length-1){

            System.out.print(a[i]+".");
        }
        else{
            System.out.print(a[i]+",");
        }
    }
    scan.close();
}

}

import java.util.*;

public class Solution {

public static void main(String[] args) {

    Scanner scan = new Scanner(System.in);
    int n = scan.nextInt();
    int a[] = new int [n];
    for(int i = 0;i<n;i++)
    {
        a[i] = scan.nextInt();
    }
    scan.close();

    // Prints each sequential element in array a
    for (int i = 0; i < a.length; i++) {
        System.out.println(a[i]);
    }
}

}