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

int main() {
    int n;
    scanf("%d", &n);

    char names[n][100];  // To store names
    int invalid = 0;

    for (int i = 0; i < n; i++) {
        scanf("%s", names[i]);

        // Check if the name contains only alphabets
        for (int j = 0; names[i][j] != '\0'; j++) {
            if (!isalpha(names[i][j])) {
                invalid = 1;
                break;
            }
        }
        if (invalid) break;
    }

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