Pisces discovered a piece of Morse code. When he translated the Morse code into English, he still did not understand the meaning of translated message. After several days of hardworking, he finally discovered that the passage was encrypted using a "fence transposition" method. The so-called "fence transposition" method is to truncate the letters in the ciphertext into two lines of the same length and then insert the letters of the second line into the first line in turn to obtain the plaintext. For example, we have a ciphertext "ACEBDF". We cut it in half, then we get "ACE" in the first line, "BDF" in the second line. We then insert "B" between "A" and "C", "D" between "C" and "E", and so on. After insertion, we get plaintext "ABCDEF". Now, Pisces gives you the original Morse code. Please find the plaintext for him.