let myDocument = ActivePresentation.Slides.Item(1)
let s = myDocument.Shapes
for(let i = 1; i <= s.Count; i++){
    if(s.Item(i).HorizontalFlip == msoTrue){
        s.Item(i).Flip (msoFlipHorizontal)
    }
    if(s.Item(i).VerticalFlip == msoTrue){
        s.Item(i).Flip (msoFlipVertical)
    }
}