#include<stdio.h>
#include<string.h>
#include<ctype.h>
int main() {
    char name[100];
    int length, i, j is_invalid =0;
    printf("Enter a name");
    if (fgets(name, sizeof9name), stdin) ==NULL){
        return 1;
    }
    length = strlen(name);
    if (length >0 && name [length - 1] =='\n'){
        name[length - 1] = '\\0';
        length--;
        }
    for(i = 0;i <= length;i++){
        if (isdigit(name[i])){    
            is_invalid = 1;
            break;
        }
    }
    if(is_invalid){
        printf("Invalid input\\n");
    } else {
        for(i=0;i<length;i++){
            for(j=0;j<length;j++){
            }
            print("\\n");
        }
    }
    return 0;
}