#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");
        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++)
        {
           printf(" ");
        }
    }
    printf("\n");
    }
   
    return 0;
}
int main()
{
    char name[11];
    printf(" ");
    fgets(name,sizeof(name),stdin);
    name[strcspn(name,"\n")]= '\0';
    create_equilateral_triangle(name);
    return 0;
}