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

int isValidName(char name[]) {
    for (int i = 0; name[i] != '\0'; i++) {
        if (!isalpha(name[i])) {   
            return 0;
        }
    }
    return 1;
}

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

    char names[1000][100]; 
    int tail = 0;          r

    for (int i = 0; i < n; i++) {
        scanf("%s", names[tail]);
        if (!isValidName(names[tail])) {
            printf("Invalid input");
            return 0;
        }
        tail++;
    }

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

    return 0;
}