In a certain code language, ‘POLE’ is coded as ‘6431’ and ‘PLOT’ is coded as ‘4635’.How is ‘T’ coded in the given language?

Given: 

In a certain code language, ‘POLE’ is coded as ‘6431’ and ‘PLOT’ is coded as ‘4635’.​​

P, O, L and 6, 4, 3 are common in both.

So, the code of T is 5.