#include<stdio.h>
#include<ctype.h>
#include<string.h>
int main() {
    char name[50];
    fgets(name, sizeof(name), stdin);
    name[strcspn(name, "\n")] = '\0';
    for (int i = 0; name[i] != '\0'; i++)
    {
        if (isdigit(name[i])) {
            printf("Invalid input");
            return 0;
        }
    }
    int len = strlen(name);
    for (int i = 1; i <= len; i++) {
        for (int j = 0; j <=n-i; j++) {
            printf("%c", name[j]);
        }
        printf("%*s");
    }
    return 0;
}