#include <stdio.h>
int main()
{
    int age;
    printf("Enter your age:");
    scanf("%d",&age);
    if(age<=0)
    {
        printf("Invalid input\n");
    }
    else if(age>=18)
    {
        printf("eligible\n")
    }
    else
    {
        ("not eligible\n");
    }
    return 0;
}