import java.io.*;

import java.math.*;

import java.security.*;

import java.text.*;

import java.util.*;

import java.util.concurrent.*;

import java.util.regex.*;

public class Solution {

// Complete the encryption function below.

static String encryption(String s) {

String st = s.replaceAll("\\s", "");

String res = "";

int len = st.length();

double sq = Math.sqrt(len);

int r = (int) Math.floor(sq);

int c = (int) Math.ceil(sq);

if(r*c<len)

r=c;

else if(r*r>=len)

c=r;

char mat[][] = new char[r][c];

int x=0;

for(int i=0;i<r;i++)

{

for(int j=0;j<c;j++)

{

if(x>=len)

mat[i][j]='A';

else

mat[i][j]=st.charAt(x++);

}

}

x=0;

for(int i=0;i<c;i++)

{

for(int j=0;j<r && x<len;j++)

{

if(mat[j][i] == 'A')

continue;

x++;

res += mat[j][i];

}

res += ' ';

}

return res;

}

private static final Scanner scanner = new Scanner(System.in);

public static void main(String[] args) throws IOException {

BufferedWriter bufferedWriter = new BufferedWriter(new FileWriter(System.getenv("OUTPUT_PATH")));

String s = scanner.nextLine();

String result = encryption(s);

bufferedWriter.write(result);

bufferedWriter.newLine();

bufferedWriter.close();

scanner.close();

}

}