fn main() {
	let mut s = String::new();
	std::io::stdin().read_line(&mut s).ok();
	let s: Vec<char> = s.trim().chars().collect();
	let n = s.len();
	let mut ans = s[0].to_string();
	for i in 1..n {
		if s[i- 1] != s[i] { ans.push(s[i]); }
	}
	println!("{}", ans);
}