When a MAC address has letters in it how do you calculate the lowest value for Root Bridge selection ?

Hex / Decimal

0 = 0

1 = 1

2 = 2

.........

9 = 9

A = 10

B = 11

C = 12

D = 13

E = 14

F = 15

10 = 16

11 = 17

..........

1E = 30

1F = 31

https://learningnetwork.cisco.com/thread/10851