print("Please say your age: ");
i = toNumber(readln());
if(i < 18)
{
    if(i < 13)
        println("You are a preteen");
    else
        println("You are a teenager");
}
else
{
    if(i < 20)
        println("You are an adult, but are still a teenager");
    else
        println("You are an adult");
}