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

#define SIZE 256

struct tree 
{
    char value[SIZE];
    struct tree* left;
    struct tree* right;
};

void trim_whitespace(char* str) 
{
    int i=strlen(str)-1;
    while (i>=0 && isspace(str[i])) 
    {
        str[i]='\0';
        i--;
    }
}

struct tree* read_tree() 
{
    char buffer[SIZE];
    if (fgets(buffer, SIZE, stdin)==NULL) 
    {
        return NULL;
    }
    if (buffer[0]=='\n') 
    {
        return NULL;
    }
    trim_whitespace(buffer);
    struct tree* node=(struct tree*)calloc(1, sizeof(struct tree));
    strcpy(node->value, buffer);
    if (buffer[0]!='*') 
    {
        node->left=read_tree();
        node->right=read_tree();
    }
    return node;
}

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

int count_answers(struct tree* tree) 
{
    if (tree==NULL) 
    {
        return 0;
    }
    if (tree->value[0]=='*') 
    {
        return 1;
    }
    return count_answers(tree->left)+count_answers(tree->right);
}

void run_knowledge_system(struct tree* node) 
{
    if (node==NULL) 
    {
        return;
    }
    if (node->value[0]=='*') 
    {
        printf("%s\n", node->value);
    } 
    else 
    {
        printf("%s\n", node->value);
    }
    if (node->value[0]=='*') 
    {
        return;
    }
    if (node->left!=NULL || node->right!=NULL) 
    {
        char answer[10];
        if (fgets(answer, sizeof(answer), stdin)==NULL) 
        {
            printf("Koniec\n");
            return;
        }
        if (answer[0]=='a') 
        {
            run_knowledge_system(node->left);
        } 
        else if (answer[0]=='n') 
        {
            run_knowledge_system(node->right);
        } 
        else 
        {
            printf("Nespravny vstup.\n");
            return;
        }
    }
}

int main() 
{
    struct tree* knowledge_base=read_tree();
    char empty_line[SIZE];
    if (fgets(empty_line, SIZE, stdin)==NULL || empty_line[0]!='\n') 
    {
        printf("Nespravna baza pravidiel.\n");
        if (knowledge_base!=NULL) 
        {
            destroy_tree(knowledge_base);
        }
        return 1;
    }
    if (knowledge_base==NULL) 
    {
        printf("Nespravna baza pravidiel.\n");
        return 1;
    }
    int answer_count=count_answers(knowledge_base);
    printf("Expert_x_bufetu_to_vie.\n");
    printf("Pozna_%d_druhov_ovocia_a_zeleniny.\n", answer_count);
    printf("Odpovedajte_'a'_pre_prvu_moznost_alebo_'n'_pre_druhu_moznost.\n");
    run_knowledge_system(knowledge_base);
    destroy_tree(knowledge_base);
    return 0;
}