Long ago, the king of Madadia lost the combination of the safe where the secret Madadian Kebab recipe was held. The most prolific safe cracker in Madadia's prison system was sent for, with a royal pardon if he succeeded in opening the safe.

His name was Al Krakit, and after several attempts at bypassing the combination, he realised that the only way to open the safe safely was by trying every possible combination by hand.

The lock was a 4-character code, with 2 of them being letters of either case and the other 2 being numbers.

Not knowing what case the letters are, what would be the maximum number of attempts Al Krakit would need to make to find the correct code?

Note that the code is case sensitive.