Fifty Shingles of Grey Roofing

Traverse 50 buildings. (This is a long road trip. Let’s sing a song: 50 buildings with roofs on the road, 50 buildings with roofs. Take one down and pass it around, 49 buildings with roofs on the road. 49 buildings with roofs on the road, 49 buildings with roofs. Take one down and pass it around, 48 buildings with roofs on the road. 48 buildings with roofs on the road, 48 buildings with roofs. Take one down and pass it around, 47 buildings with roofs on the road. 47 buildings with roofs on the road, 47 buildings with roofs. Take one down and pass it around, 46 buildings with roofs on the road. 46 buildings with roofs on the road, 46 buildings with roofs. Take one down and pass it around, 45 buildings with roofs on the road. 45 buildings with roofs on the road, 45 buildings with roofs. Take one down and pass it around, 44 buildings with roofs on the road. 44 buildings with roofs on the road, 44 buildings with roofs. Take one down and, oh there's a character limit. That's disappointing. Nevermind.)