#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main() {
    char name[11];
    printf("Enter a name (up to 10 characters: ");
    fgets(name, 11, stdin);
    name[strcspn(name, "\n")] = 0;
    for (int k)
        if (isdigit(name[i])) {
            printf("Invalid input\n");
            return 0;
        }
    }
    if (strlen(name) == 0) {
        printf("Invalid input\n");
    } else {
        for (int i = 1; i <= strlen(name); i++) {
            printf(" %.*s\n ", i, name);
        }
    }
    return 0;
}