use proconio::input;

fn main() {
    input! {
        n:usize,
        c:[[String;4];n],
    }

    let mut g = vec![vec![]; n];
    for i in 0..n {
        for j in 0..4 {
            if c[i][j] == "H" {
                continue;
            }
            g[i].push(c[i][j].parse::<usize>().unwrap() - 1);
        }
    }

    dfs(0, n, &g);
    println!("methane");
}

fn dfs(crr: usize, prv: usize, g: &Vec<Vec<usize>>) {
    if crr != 0 {
        print!("(");
    }

    for &nxt in g[crr].iter() {
        if nxt == prv {
            continue;
        }

        dfs(nxt, crr, g);
    }

    if crr != 0 {
        print!("methyl)");
    }
}