fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let n: Vec<usize> = s.split_whitespace().flat_map(str::parse).collect();
	s.clear();
	std::io::stdin().read_line(&mut s).ok();
	let mut v = vec![];
	s.chars().enumerate().for_each(|(i, c)| match c {
		'(' => v.push(i + 1),
		_ => {
			if let Some(j) = v.pop() {
				match n[1] {
					x if x == j => println!("{}", i + 1),
					x if x == i + 1 => println!("{}", j),
					_ => {}
				}
			}
		}
	});
}