// expect: 98/0/0/0/
include rt;
void pn(int x) { rt.put_n(x); rt.put_c(10); }
fn main() {
	bstr s = b"abc";
	pn(s[1]);
	pn(s[3]);
	pn(s[5]);
	pn(s[-1]);
	return 0;
}