public String getLCS(int i, int j)
	{
		LinkedList<Character> lst = new LinkedList<>();
		while (i >= 0 && j >= 0)
		{
			if (X.charAt(i) == Y.charAt(j))
			{
				lst.addFirst(X.charAt(i));
				i--;
				j--;
			}
			else
			{
				if (len[i][j] == len[i][j - 1])
					j--;
				else
					i--;
			}
		}

		return lst.toString();
	}