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

#define SIZE 100

struct tree {
    char* value;
    struct tree* left;
    struct tree* right;
};

struct tree* read_tree(int* counter) {
    char buffer[SIZE];
    memset(buffer, 0, SIZE);
    char* r = fgets(buffer, SIZE, stdin);
    if(r == NULL){
        printf("Expert z bufetu to vie.\n");
        printf("Chybna databaza\n");
        return NULL;
    }
    if (buffer[0] == '\n') {
        return NULL;
    }
    struct tree* tree = calloc(1, sizeof(struct tree));
    tree->value = malloc(strlen(buffer) + 1);
    strcpy(tree->value, buffer);
    if (buffer[0] == '*') {
        (*counter)++;
        return tree;
    }
    tree->left = read_tree(counter);
    tree->right = read_tree(counter);
    return tree;
}

void destroy_tree(struct tree* tree) {
    if (tree == NULL) return;
    destroy_tree(tree->left);
    destroy_tree(tree->right);
    free(tree->value);
    free(tree);
}

void print_tree(struct tree* tree) {
    if (tree == NULL) return;
    printf("%s", tree->value);
    if (tree->value[0] == '*') {
        printf("Koniec\n");
        return;
    }
    getchar();
    char r = getchar();
    if (r == 'a') {
        print_tree(tree->left);
    } else if (r == 'n') {
        print_tree(tree->right);
    } else if (r == EOF) {
        printf("Koniec vstupu\n");
    } else {
        printf("Nerozumiem\n");
        exit(0);
    }
}

int main() {
    int counter = 0;
    struct tree* root = read_tree(&counter);
    if(root != 0){
        printf("Expert z bufetu to vie.\n");
        printf("Pozna %d druhov ovocia a zeleniny.\n", counter);
        printf("Odpovedajte 'a' pre prvu moznost alebo 'n' pre druhu moznost.\n");
        print_tree(root);
    }
    destroy_tree(root);
    return 0;
}