Setanta 0.3.3, 64 60 35 bytes

Unfortunately, this challenge is impossible in the current version of Setanta. There is no equivalent to ord, so you have to get the a from the string representation of some object. However, this requires either go_téacs (equivalent of toString) or nasc (equivalent of join), both of which contain an a – "" + obj doesn’t work. However, before Setanta 0.4.0, go_téacs was called go_lit, making it possible to complete the challenge.

The solution gets the a from neamhní (null).

gniomh b(){}scriobh(go_lit(b())[2])