[4th Day of Memories] Memories of Support

I'm thankful for all the happy times I've shared with the people of Maple World, especially during the amazing Legends celebration. If we should remember anything from that, it should be the spirit of cooperation that everyone displayed. I've prepared something to help remember that spirit, if you can help me...

Great! See, we came up with a Commemorative Stamp for everyone. Of course, what better symbol is there than the red maple leaf of MapleStory? The thing is, we accidentally shipped them to the dungeons instead of the towns. Maple Legends Commemorative Stamps can be obtained from regular monsters, so bring me 50 of them. You won't find any on monsters who are more than 10 levels below you or 20 levels above you, though.

Really? They're super nice stamps. Don't you like stamps?

Could you make sure you have all the Maple Legends Commemorative Stamps that I needed?