#include <stdio.h>
#define LIMIT 20
#define IN 1
#define OUT 0

int main(void)
{

    /*
     * The freq array will be used to store a frequency of values associated to a natural
     * number from 1 to 20 included. The word variable indicates whether the c variable
     * currently holds a value that is inside or outside of a word. The count variable
     * keeps count of the current number of characters inside the word we're evaluating.
     * The toolong variable is just there to prevent a segfault in case the word exceeds
     * the number of elements included in the freq array, so that we don't increment
     * a nonexistent value.
    */
    char c;
    int freq[LIMIT];
    for (int i = 0; i <= LIMIT; ++i) freq[i] = 0;
    int word = OUT;
    int count = 0;
    int toolong = 0;

    /*
     * Evaluate the current character's ASCII value:
     * 1) If it's neither an uppercase nor a lowercase letter, then it's not a word.
     * if the number of letters in the current word doesn't exceed the limit,
     * then increment the freq array's element corresponding to that word's length.
     * 2) If we're not currently inside a word, yet the ASCII value of the current char
     * corresponds to a letter, then we've just entered a word. Bring the counter back to zero.
    */
    while ((c = getchar()) != EOF) {
        if ((c < 'A' || c > 'z') || (c > 'Z' && c < 'a')) {
            word = OUT;
            if (count <= LIMIT) ++freq[count];
            else ++toolong;
        }
        else if (word == OUT) {
            word = IN;
            count = 0;
        }
        ++count;
    }

    /*
     * Prints all natural numbers from 1 to 20, and next to each number, prints one
     * '*' character for every instance of a word containing that number of characters.
     * Then, print the number of words that were too long to be taken into account.
    */
    for (int i = 1; i <= LIMIT; ++i) {
        printf("| %2d | ", i);
        for (int f = 1; f <= freq[i]; ++f) printf("*");
        putchar('\n');
    }
    printf("Number of words that were too long to be taken into account: %d\n", toolong);

    return 0;
}