As a lowercase letter A was used by F to make the word "fart" in order to prank L. A along with S, O and Y witnessed how F formed the word "frick". Which made all the letters turn on F.

Somewhere before F's attack, A grew into his uppercase form.

In A, he introduces himself. In G, G calls A, B and C to form "CAB" to track down F. In H, they miss F hiding behind H. In J, "CAB" waits for G as J gets annihilated by I's cannonball shot by F. In K, "CAB" and G rush toward F beside I, J and K.