# include <stdio.h>
#include <ctype.h>
#include< string.h>
int isValidinput(char name[])
    if(strlen(nae)==0){
        return 0;
    }
    for(inti=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;i++)
            {
                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[strcspn(name,"\n")]='\0';
    if(!isValidinput(name)){
        printf("Invalid input\n");
        return 0;
    }
    printpyramid(name);
    return 0;
    
}