Answer away...

Today we went down to Lucky Chinatown. Me, Roy and Jiawen.

We found the place in the end, and the shop.

And we got our forehead protectors! Yes. I got the Leaf one, Roy got the Sand one. Also, I got a Shuriken and he got a Full Metal Alchemist chain and pendant.

This is what it looks like:


When I got home it was only a while before we went out for dinner.

And the day passed like that.

School tomorrow. I still have a headache to shake off.

Anyway, I'm sure some of you are dying to know the answer.

Question:
What is the purpose of the alphabet behind our Identification Numbers?

Clues given:
- It's a precaution!
- Sometimes people make mistakes.

Answer:
When we go pass the checkpoints when we enter or leave the country, our numbers would be entered by the immigration officers. However, sometimes 3's and 8's or 1's and 7's are mixed up, and the wrong number is entered. Then the alphabet comes in.

If the wrong number is entered with the alphabet, the system would reject the entry and request for re-entering.

If your number is S1234567A, all other numbers that differ by a digit, no matter which one of the 56 possible numbers, will not have the letter A at the back.