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

#define MAX_NAME_LENGTH 100
#define MAX_VISITORS 100

int check_special_characters(char *name) {
    int len = strlen(name);
    for (int i = 0; i < len; i++) {
        if (!isalpha(name[i])) {
            return 1; // Special character found
        }
    }
    return 0; // No special characters found
}

int main() {
    int n;
    scanf("%d", &n);
    getchar(); // Consume newline left-over

    char names[MAX_VISITORS][MAX_NAME_LENGTH];
    int valid = 1;

    for (int i = 0; i < n; i++) {
        fgets(names[i], sizeof(names[i]), stdin);
        names[i][strcspn(names[i], "\n")] = 0; // Remove newline character

        if (check_special_characters(names[i])) {
            printf("Invalid input\n");
            valid = 0;
            break;
        }
    }

    if (valid) {
        for (int i = 0; i < n; i++) {
            printf("%s", names[i]);
            if (i < n - 1) {
                printf(" ");
            }
        }
        printf("\n");
}