If 'MISTAKE' is coded as 9765412 and 'NAKED' is coded as 84123, how is 'STAIN' coded?

Correct option is B

Given,
'MISTAKE' is coded as 9765412
And
'NAKED' is coded as 84123
Here is code for
S = 6
T = 5
A = 4
I = 7
N = 8
Therefore, the code for 'STAIN' is 65478