#include <stdio.h>
#include <string.h>
#include <ctype.h>
int contains_digits(char *s) {
    for (int i = 0; s[i] != 0; i++) {
        if (isdigit((unsigned char)s[i])) {
            return 1;
        }
    }
    return 0;
}
int main()
{
    char name[12];
    if (fgets(name, sizeof(name), stdin) == NULL) {
        return 1;
    }
    name[strcspn(name, "\n")] = '\0';
    if (contains_digits(name)) {
        printf("Invalid input\n");
        return 0;
    }
    int length = strlen(name);
    if (length < 1 || length > 10) {
    }
        for (int i = 1; i <= length; i++) {
            for (int j = 0; j < i; j++) {
                printf("%c", name[j]);
            }
            printf("\n");
            printf(' ');
        }
        return 0;
    
}