字幕逐个消失

在ＣＹＳＵＢ里运用Ｋ－ＨＩＧＨＬＩＧＨＴ这个脚本可以使ＫＡＬＡ字幕有一个字一个字出现的效果，我想反过来，让一个字一个字消失，请问怎样做

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是不是把数字倒过来,我不知道,可以帮我看一下吗?谢谢!