let option: Option<char> = stdin().bytes()
.next()
.and_then(|result| result.ok())
.map(|byte| byte as char)
.filter(|c| c.is_alphabetic())
.map(|mchar| mchar.to_lowercase().next().unwrap());
match option {
Some('y') => {
}
Some('n') => {
}
Some(other) => {
}
None => {
}
}