I guess you could say "Y", because it is sometimes considered a vowel, although sometimes it isn't.
1.GOING2.SHEARS3.DOUBLE4.TUESDAY5.guage6.your7.please8.quest9.tools10.search
feet [fi:t] - long vowel fit [fit] - short vowel
O,A and I
The strong-vs.-weak designation has to do with pronunciation of words. I believe that the designation varies from language to language.