#include <stdio.h>
#include <string.h>
#include <ctype.h> // For isalnum()

// Function to check for special characters
int containsSpecialChar(const char *name) {
    for (int i = 0; name[i] != '\0'; i++) {
        if (!isalnum((unsigned char)name[i]) && name[i] != ' ') { // Allow alphanumeric and space
            return 1; // Contains special character
        }
    }
    return 0; // No special characters
}

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

    if (n < 1 || n > 1000) {
        printf("Invalid input\n");
        return 1;
    }

    char names[101]; // Assuming max name length of 100 characters + null terminator
    int invalid_input_flag = 0;

    for (int i = 0; i < n; i++) {
        scanf("%100s", names[i]); // Read name, limit to 100 chars
        if (containsSpecialChar(names[i])) {
            invalid_input_flag = 1;
            break; // Exit loop if invalid input found
        }
    }

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

    return 0;
}