Getting A ‘D’ Grade

(I go to the reception to register my membership. I’m quite conscious that English is not my first language, so I always say something like Apple for A, Boy for B, etc. so people can get my spelling right. The staff asks for my postcode, so after saying the whole postcode, I spell it again with words starting with each letter in my postcode. He gets them all correct till the last one.)

Me: “Dog.”

(He couldn’t get the letter.)

Me: “D for Dog.”

(He typed another wrong letter.)

Me: “Dog, Dan, …? ABCD?”

(He got a different wrong letter at every single attempt. So I just wrote down the whole postcode on paper and gave it to him instead. I still wonder what I did wrong for the D letter.)