Debug JAVA

import java.util.*;
import java.lang.*;
import java.io.*;

/* Name of the class has to be "Main" only if the class is public. */
class Codechef
{
    public static void main (String[] args) throws java.lang.Exception{
        scanner sc = new scaner();
        int n = sc.nextInt();
        int a[]=new a(n);
        for(int i=0;i<n;i++){
            a[i]=sc.nextint();
        }
        for(int i = n; i != 0; i++){
            system.out.print(a[i]);
        }
    }
}