#include<stdio.h>
#include<string.h>
#include<ctype.h>
void print_pyramid(char *name)
{
    int lenght = strlen(name);
    for(int i=0;i<lenght;i++)
    {
        if(isdigit(name[i]))
        {
            printf("Invalid input\n");
            return;
        }
    }
    if(lenght==0)
    {
        printf("Inva;lid input\n");
        return;
    }
    for ( int i=0;i<lenght;i++)
     {
             for (int j=0;j<=i;j++)
             {
                 printf("%c",name[j]);
                 
             }
             printf("\n");
     }
    
}
int main()
{
    char name[11];
    fgets(name,sizeof(name),stdin);
    name[strcspn(name,"\n")]=0;
    print_pyramid(name);
    return 0;
}




         
         }
         return 0;
}