Upload statistics

Can someone explain to me the letters under "Upload Statistics"? I could not find info for this and I'm not sure what they mean.

Thanks!

A - added
D - duplicate
M - marked (watermark)
P - pro
U - underaged
G - a range of things too extreme for the site
Q - low quality
A - altered in some way
O - other reason that doesnt fall under any of the others

Thank you!

Very helpful