// editor4
#include<stdio.h>
#include<string.h>
#include<ctype.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=i;<=len-i;j++)
    {
        printf(" ");
    }
    for (int j=0;j<1;j++)
    {
        printf("%c",name[j]);
        if(j<i-1)
        {
            printf(" ");
        }
    }
    printf("\n");
}
}
int main()
{
    char name[20];
    fgets(name,sizeof(name),stdin);
    name[strcspn(name,"\n")]='\0';
    if(!isValidinput(name))
    {
        printf("Invalid input\n");
        return 0;
    }
    printPyramid(name);
    return 0;
}
    }
}