There's also a little trick with notepad
. You have to open the VCV .ust in notepad (or a program like that). The lyrics are written like "Lyric=a ã" for each note.
Notepad has that nice function to replace one character string with another <i>in the whole file</i> (I think it's in Edit>Replace). That means if you try to change "- " to nothing, it will delate the string <i>everywhere</i>. But you can replace for example "Lyric=a " with "Lyric="... And the prefix "a " will be gone. Do it with rest the letters: i, u, e, o, n and "-". Save the file (but keep the original one). Open the new one in UTAU to see if everything's right.
I can't show picures, because I have a different language version, but I hope you know what to do ^^" .