#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main() {
    char main[100];
     if (fgets(name, sizeof(name), stdin)
        printf("Invalid input\n");
        return 0;
    }
    name[strcspn(name, "\n")] = '\0';
     if (strlen(name) == 0) {
        printf("Invalid input\n");
        return 0;
    }
    
     for (int i = 0; name[i] != '\0'; i++) {
        if (isdigit((unsigned char)name[i])) {
            printf("Invalid input\n");
            return 0;
        }
    }
     int len = strlen(name);
    for (int i = 1; i <= len; i++) {
        
        for (int s = 0; s < len - i; s++) {
            printf(" ");
        }
        for (int j = 0; j < i; j++) {
            printf("%c", name[j]);
            if (j != i - 1) {
                printf(" ");
            }
        }
        printf("\n");
    }
    return 0;
}