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

struct trie {
    struct trie* a[26];
    bool term;
};

struct trie* init_trie (void) {
    struct trie* t = malloc (sizeof (struct trie));
    t->term = 0;
    for (int i = 0; i < 26; ++i) t->a[i] = NULL;
    return t;
}

void add_word (struct trie* t, char* s, int i, int n) {
    if (i == n) {
        t->term = 1;
        return;
    }
    int x = s[i] - 'a';
    if (!t->a[x]) t->a[x] = init_trie ();
    add_word (t->a[x], s, i + 1, n);
}

void print_trie (struct trie* t) {
    for (int i = 0; i < 26; ++i) {
        if (t->a[i]) {
            printf ("->%c\n", 'a' + i);
            print_trie (t->a[i]);
        }
    }
    printf ("<-\n");
}

void destruct_trie (struct trie* t) {
    for (int i = 0; i < 26; ++i) if (t->a[i]) destruct_trie (t->a[i]);
    free (t);
}

int main (void) {
    struct trie* root = init_trie ();
    char* s = malloc ((int)1e4);
    int n;
    scanf ("%d", &n);
    for (int i = 0; i < n; ++i) {
        scanf ("%s", s);
        add_word (root, s, 0, strlen (s));
    }
    print_trie (root);
    destruct_trie (root);



}