#include<stdio.h>
#include<string.h>
#include<ctype.h>
int create_equilateral_triangle(char *name){
    int len = strlen(name);
    if (len < 1 || len > 10){
        printf("Invalid input\n");
        return 0;
    }
    for (int i = 0; i<len;i++){
        if (isdigit(name[i])){
            printf("Invalid input\n");
            return 0;
        }
    }
    for (int i = 1; i <= len;i++){
        for (int j = i; j < len; j++){
            if (j < i - 1) {
                 printf(" ");
             }
         }
         printf("\n");
   }
return 1;
int main() {
    char name[11];
    printf(" ");
    fgets(name, sizeof(name),stdin);
    name[strcspn(name, "\n")] = '\0';
    create_equilateral_triangle(name);
    return 0;
}