#include <stdio.h>
#include <stdlib.h>
#include <time.h>

main()
{
	srand((unsigned) time(NULL));
	
	int i, num;
    char str[27] = "abcdefghijklmnopqrstuvwxyz";
    
    num = rand() % 4 + 3;
    
    printf("Space shall be inserted after every %d letters.\n", num);

	for(i=1; i<=26; i++){
		printf("%c", str[i-1]);		

		if(i % num == 0)
			printf(" ");			
	}
	
	printf("\n");	
	
	return(0);
}