How would you say extremes of the word or edges of the word or characters at the end and at the beginning of the word (I don't know which one is correct, if any) using adjectives of qualification?
By extremes or edges of the word I mean, supposing the word is hello, the extremes would be h and o, but if I have another expression %123awe&, the extremes would be % and &.
It would be nice if we could refer to those letters as extreme letters or extreme digits or edged digits. Is one of this correct? Which alternatives do I have?