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