3rd - a
1st - e
The gold and bronze medals are unsurprisingly but did not expect 't' to be up there on the winners rostrum. E is the champion in other languages, too. George Perec famously wrote a detective novel in French without an es (as it were) La Disparition (1969. This was then translated into English by Gilbert Adair as A Void - ingenius work in both cases, though the purpose escapes me.
For more than anyone needs to know about this topic see here.