Canadian Postal Code Input field

The Canadian postal codes is formed from 3 letters and 3 numbers, interposed. Example: M1K 3H7

The Canadian postal code is quite tricky for a user to enter into an input form field, especially on mobile devices where the user needs to switch between the keyboards (Alphabet to Number keyboard). He needs to switch 5 or 6 times between keyboard layouts!

Separating the field in two might give complicate the experience even more. Do you have any suggestions of how to ease the experience?