Encryption System Parameter k

An encryption system operates as follows: Step 1. Fix a number $k$ ($k \le 26$). Step 2. For each word, swap the first $k$ letters from the front with the last $k$ letters from the end in reverse order. If a word contains less than $2k$ letters, write the entire word in reverse order. Step 3. Replace each letter by a letter $k$ spaces ahead in the alphabet. If you cross Z in the process to move $k$ steps ahead, start again from A. Example: $k = 2$: zebra --> arbez --> ctdgb. If the word "flight" becomes "znmorl" after encryption, then the value of k: