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

#define SIZE 256

typedef struct Tree {
    char text[SIZE];
    int isAnswer;
    struct Tree *yes;
    struct Tree *no;
} Tree;

Tree* readTree() {
    char line[SIZE];

    if (fgets(line, SIZE, stdin) == NULL) return NULL;

    line[strcspn(line, "\r\n")] = 0;

    if (line[0] == '\0') return NULL;

    Tree *node = (Tree*)malloc(sizeof(Tree));
    node->yes = NULL;
    node->no = NULL;

    if (line[0] == '*') {
        node->isAnswer = 1;

        int i = 1;
        while (line[i] == ' ') i++;
        strcpy(node->text, line + i);
    } else {
        node->isAnswer = 0;
        strcpy(node->text, line);

        node->yes = readTree();
        node->no = readTree();
    }

    return node;
}

int EmptyLine() {
    char line[SIZE];

    if (fgets(line, SIZE, stdin) == NULL) return 0;

    return line[0] == '\n';
}

int Leaves(Tree *node) {
    if (node == NULL) return 0;
    if (node->isAnswer) return 1;
    return Leaves(node->yes) + Leaves(node->no);
}

void freeTree(Tree *node) {
    if (node == NULL) return;
    freeTree(node->yes);
    freeTree(node->no);
    free(node);
}

void start(Tree *node) {
    char input[SIZE];

    while (node != NULL && node->isAnswer == 0) {
        printf("%s\n", node->text);

        if (fgets(input, SIZE, stdin) == NULL) {
            printf("Nespravny vstup\n");
            return;
        }

        int i = 0;
        while (input[i] == ' ' || input[i] == '\t') i++;

        if (input[i] == 'a') {
            node = node->yes;
        } else if (input[i] == 'n') {
            node = node->no;
        } else {
            printf("Nespravny vstup\n");
            return;
        }
    }

    if (node && node->isAnswer) {
        printf("*%s\n", node->text);
        printf("Koniec\n");
    }
}

int main() {
    printf("Expert z bufetu to vie.\n");

    Tree *root = readTree();

    if (root == NULL) {
        printf("Chyba nacitania\n");
        return 0;
    }

    int count = Leaves(root);

    printf("Pozna %d druhov ovocia a zeleniny.\n", count);
    printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");

    start(root);

    freeTree(root);
    return 0;
}