#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main()
{
    char name[11];
    int length, i, j, invalid_input = 0;
    printf("Enter a name: ");
    if (scanf("%10s", name) != 1) 
    {
        printf("Invalid Input\n);
        return 1;
    }
    length = strlen(name);
    for (i = 0; i < length; i++)
    {
        if (isdigit(name[i])) 
        {
            invalid_input = 1;
            break;
        }
    }
    if (invalid_input)
    {
        printf("Invalid Input\n);
    } 
    else
    {
        for (i = 0; i < length; i++)
        {
            for (j = 0; j <= i; j++) 
            {
                printf("%c", name[j]);
            }
            printf("\n");
        }
    }
    return 0;
    
}