public class RandomBTree {
    private static int nextLabel = 0;

    private static String s = "abcdefghijklmnopqrstuvwxyz";
    
    //print a random tree with n leaf nodes, in newick format, use nextLabel to
    //choose a unique label for the leaf
    public static void printRandomBTree(int n) {
	if(n == 1){
	    int i = nextLabel++;
	    System.out.print(s.substring(i,i+1));
	}
	else {
	    //take a random number of leaves to go in the left subtree, the
	    //balance go in the right subtree
	    int split = 1 + (int)((n - 1) * Math.random());
	    System.out.print("(");
	    printRandomBTree(split);
	    System.out.print(",");
	    printRandomBTree(n - split);
	    System.out.print(")");
	}
    }
    
    public static void main(String[] args) {
	printRandomBTree(Integer.parseInt(args[0])); 
	System.out.println(";");
	System.out.println();
	System.out.print(args[0] + " species");
    }
}