Answer : 5
Explanation : Given that, For each letter in the word (FLIES) there is a code written and also that code is denoted by either 1 , 2, 3, 4 or 5
Apply the below code, It exactly matches the Given Condition
Letters at odd- numbered places shift three positions backward and letters at even-numbered places shift two positions forward as in English alphabet.
Here, Odd- Numbered Places F, I , S shift three positions backward in English Alphabet.
Even- Numbered Places L, E shift two positions forward in English Alphabet.
Therefore, exact code for the underline letter (F) is C.
So the Answer is 5.