import java.util.*;

public class Gen {
  public static void main(String[] args) {
    String base = "";
    Random rnd = new Random(0);
    for (int i = 0; i < 50; i++) {
      //int pos = rnd.nextInt(base.length() + 1);
      int pos = i;
      base = base.substring(0, pos) + "{}" + base.substring(pos);
    }
    String t = "t";
    String s = "ssssssssssssssssssss";
    int d = 0;
    System.out.println(100);
    for (int i = 0; i < 100; i++) {
      if (base.charAt(i) == '}') --d;
      for (int j = 0; j < d; j++) {
        if (rnd.nextBoolean()) System.out.print(t); else System.out.print(s);
      }
      if (base.charAt(i) == '{') ++d;
      System.out.println(base.charAt(i));
    }
  }  
}