How to remove single characters with sed?

Question

linux

How to remove all single characters from the test string "asdg sd d fgdfh mm sdf 1 2 33 a bb vaa i" using sed?
Tried like this:

echo 'asdg sd d fgdfh m m sdf 1 2 33  а бб ваа я' | sed  's/\b([\S]{1})\b//g'

Answer 1

echo 'asdg sd d fgdfh m m sdf 1 2 33  a bb baaaaa z' | sed -r 's/\b\S{1}\b//g'