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

#define MAX_VISITORS 1000
#define MAX_NAME_LEN 100

int isValidName(char *name) {
    for (int i = 0; name[i] != '\0'; i++) {
        if (!isalnum(name[i]) && !isspace(name[i])) {
            return 0; /
        }
    }
    return 1; // Name is valid
}

int main() {
    int n;
    char names[MAX_VISITORS][MAX_NAME_LEN];

    scanf("%d", &n);

    if (n < 1 || n > MAX_VISITORS) {
        printf("Invalid input\n");
        return 0;
    }

    for (int i = 0; i < n; i++) {
        scanf(" %[^\n]", names[i]); // Read full line including spaces
        if (!isValidName(names[i])) {
            printf("Invalid input\n");
            return 0;
        }
    }

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

    return 0;
}