/* program to create input files */
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

int main(int argc,char **argv)
{
  int N,i,critter;

  srand(time(NULL));
  if(argc != 2)
    {
      printf("Usage: %s <Number>\n",argv[0]);
      exit(1);
    }
  N = atoi(argv[1]);
  printf("%d\n",N);
  for(i=0;i<N;i++)
    {
      critter = (rand() >> 17) & 1;
      if(critter)
	printf("O\n");
      else
	printf("Z\n");
    }
  return 0;
}