use std::io::Read;

fn main() {
	let mut s = String::new();
	std::io::stdin().read_to_string(&mut s).ok();
	let s: Vec<_> = s.lines().collect();
	if s[1].len() == 1 && s[0].contains(s[1]) {
		println!("-1");
		return;
	}
	let (mut n, mut p) = (0, 0);
	while let Some(i) = s[0][p..].find(s[1]) {
		p += i + s[1].len() - 1;
		n += 1;
	}
	println!("{}", n)
}