import java.util.Scanner;
class Main{
	public static void main(String[] args){
		Scanner sc = new Scanner(System.in);
		int N = sc.nextInt();
		int[][] path = new int[N][];
		for(int i=0;i<N;i++){
			int[] temp = new int[4];
			for(int j=0;j<4;j++){
				String C = sc.next();
				if(C.equals("H"))
					temp[j] = -1;
				else
					temp[j] = Integer.parseInt(C)-1;
			}
			path[i] = temp;
		}
		StringBuilder ans = new StringBuilder();
		dfs(0,path,ans);
		System.out.println(ans.toString());
	}
	private static void dfs(int now,int[][] path,StringBuilder ans){
		for(int next:path[now]){
			if(next!=-1){
				ans.append("(");
				for(int i=0;i<4;i++)
					if(path[next][i]==now)
						path[next][i] = -1;
				dfs(next,path,ans);
				ans.replace(ans.length()-3,ans.length(),"yl)");
			}
		}
		ans.append("methane");
	}
}