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

int main(void)
{
    srand((unsigned) time(NULL));

    int i, j, dots;

    for(i=1; i<=3; i++)
    {
        dots = rand() % 4 + 1;

        for(j=1; j<=dots; j++)
        {
            printf("● ");
        }

        printf("\n");
    }

    return 0;
}