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

class Main {
    public static String reshape(int n, String str){
        if(str==null){
            return null;
        }
        StringBuilder reshapeString = new StringBuilder();
        char[] stringToChar = str.replaceAll(" ", "").toCharArray();
        int j= 0;
        for(int i=0; i<stringToChar.length;i++){
            j++;
            reshapeString.append(stringToChar[i]);
            if(j==n && i<stringToChar.length-1){
               reshapeString.append("\n"); 
               j=0;
            }
        }
        return reshapeString.toString();
    }
    
    public static void main(String[] args) {
        System.out.println(reshape(3,"abc de fghi"));
        System.out.println(reshape(2,"1 23 456"));
    }
}