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

#define MAX_NAME_LENGTH 100

int compare(const void *a, const void *b) {
    return strcmp(*(const char **)a, *(const char **)b);
}

int main() {
    int max_students;
    char temp[MAX_NAME_LENGTH];
    char **students;
    int count = 0, unique_count = 0;
    
    if (scanf("%d", &max_students) != 1 || max_students <= 0) {
        puts("Nespravny vstup");
        return 1;
    }
    
    students = malloc(max_students * sizeof(char *));
    if (students == NULL) {
        puts("Memory allocation failed");
        return 1;
    }
    
    while (scanf("%99s", temp) == 1) {
        int is_unique = 1;
        for (int i = 0; i < unique_count; i++) {
            if (strcmp(students[i], temp) == 0) {
                is_unique = 0;
                break;
            }
        }
        
        if (is_unique) {
            students[unique_count] = strdup(temp);
            if (students[unique_count] == NULL) {
                puts("Memory allocation failed");
                for (int i = 0; i < unique_count; i++) {
                    free(students[i]);
                }
                free(students);
                return 1;
            }
            unique_count++;
            if (unique_count >= max_students) {
                break;
            }
        }
    }
    
    if (unique_count == 0) {
        puts("Ziadne prihlasky");
        free(students);
        return 1;
    }
    
    qsort(students, unique_count, sizeof(char *), compare);
    
    puts("Prijati studenti:");
    for (int i = 0; i < unique_count; i++) {
        puts(students[i]);
    }
    
    for (int i = 0; i < unique_count; i++) {
        free(students[i]);
    }
    free(students);
    
    return 0;
}