The number of words starting from A are 5! = 120
The number of words starting from I are 5! = 120
The number of words starting from KA are 4! =24
The number of words starting from KI are 4! =24
The number of words starting from KN are 4! =24
The number of words starting from KRA are 3! = 6
The number of words starting from KRIA are 2! = 2
The number of words starting from KRIN are 2! = 2
The number of words starting from KRISA are 1! = 1
The number of words starting from KRISNA are 1! = 1
Hence, rank of word ‘KRISNA = 2(120) + 3(24) + 6 + 2(2) + 2(1) = 324