Task: Question Answering
Input (English): Last night, I had a party at my house. Many people were there and most of my friends hung out in both the kitchen and the living room. The living room was fine, but the kitchen was a disaster. I felt the need to clean the floor and in an effort to do so, I took out a mop and mopped up the floor. This took some of the stickiness away and made it feel much better. I sprayed cleaner on the floor before cleaning it and also did some sweeping. This felt good and I was able to clean the floor. After sweeping and mopping the floor, I let it sit for a while so  that I didn't slip on it. It looked shiny and I felt like my house was much cleaner than when my friends came over. Next time, I will follow the same routine when cleaning. 
Question: Who made the mess?
Output (English): Their friends