संदेश गुप्त राखण्यासाठी जितू आणि अलेक्स यांनी पुढील नियमांवर आधारित संकेत प्रणाली तयार केली.
(a) A ते M पर्यंतच्या प्रत्येक अक्षराऐवजी वर्णक्रम उलटा गणून Z ते N चा समक्रम असणारे अक्षर ठेवायचे म्हणजे A होईल Z, B होईल Y, असे क्रमाने होईल. N ते Z या वर्णाक्षरांऐवजी A ते M वर्णाक्षरे ठेवायची म्हणजे N होईल A, O होईल B, असे क्रमाने होईल.
(b) प्रक्रिया (a) मधून मिळालेल्या प्रत्येक अक्षराऐवजी सर्व वर्णाक्षरे उलट्या क्रमाने मांडून त्या प्रत्येक अक्षराचा दोन अंकी क्रम तेथे ठेवायचा, म्हणजे A होईल 26, B होईल 25, X होईल 03 असे क्रमाने होईल.
याच प्रणालीवर आधारित LUKEWARM या शब्दाचा संकेत निवडा -

The correct answer is Option B (1219110517012213).

Key Points:
• Step-by-Step Encoding Process for word LUKEWARM:
• Operation (a): Split alphabet into halves: A-M (1-13) maps to Z-N (26-14 in reverse), meaning letter x (1 to 13) becomes 27 - x. N-Z (14-26) maps to A-M (1-13 in order), so letter y (14 to 26) becomes y - 13.
• Operation (b): Take the resulting letter and replace it by its reverse-alphabet rank (where Z=01, Y=02, ..., A=26, i.e., Rank = 27 - standard position).
• Let's calculate for each letter of LUKEWARM:
• 1. L (12th): By (a), 27 - 12 = 15 -> O. By (b), O's reverse rank is 27 - 15 = 12.
• 2. U (21st): By (a), 21 - 13 = 8 -> H. By (b), H's reverse rank is 27 - 8 = 19.
• 3. K (11th): By (a), 27 - 11 = 16 -> P. By (b), P's reverse rank is 27 - 16 = 11.
• 4. E (5th): By (a), 27 - 5 = 22 -> V. By (b), V's reverse rank is 27 - 22 = 05.
• 5. W (23rd): By (a), 23 - 13 = 10 -> J. By (b), J's reverse rank is 27 - 10 = 17.
• 6. A (1st): By (a), 27 - 1 = 26 -> Z. By (b), Z's reverse rank is 27 - 26 = 01.
• 7. R (18th): By (a), 18 - 13 = 5 -> E. By (b), E's reverse rank is 27 - 5 = 22.
• 8. M (13th): By (a), 27 - 13 = 14 -> N. By (b), N's reverse rank is 27 - 14 = 13.
• Combining the numbers:
• 12, 19, 11, 05, 17, 01, 22, 13 -> 1219110517012213.
• Matches Option (2).
• Key Takeaway: Track two-step transformations systematically by mapping the intermediate letter and then applying reverse positional values.