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In a certain code the alphabets A , B , C , ldots are given ranks 1 , 2 , 3 , . . . . . . . respectively, and then n th letter is coded as k th letter where 1 ≤ k ≤ 26 and 5 n ≡ k ( m o d 26 ) . For example, the 12 th letter L is coded as the 8 th letter H because 60 ≡ 8 ( mod 26) . For decoding reverse process is followed. Based on this answer questions from 56 to 60
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