hackerrank:Encryption

import java.io.*;
import java.util.*;
import java.text.*;
import java.math.*;
import java.util.regex.*;

public class Solution
{
public static void main(String[] args)
{
Scanner sc = new Scanner(System.in);
String s = sc.next();
int n=s.length();
int row=(int)Math.floor(Math.sqrt(n));
int coloum=(int)Math.ceil(Math.sqrt(n));
char ch[]=s.toCharArray();
String s1="";
for(int i=0;i<coloum;i++)
{
int j=i;
while(j<n)
{
s1=s1+ch[j];
 j=j+coloum;
}
s1=s1+" ";
}
System.out.println(s1);
}
}