Contribution #1647

Problem: en/8.3.15

Added Luis's English solution of 8.3.15

Editor: Luis Daniel Fernández Quintana ( @Luisito )

Time: June 25, 2024 at 04:22 AM

GitHub commit: c5a4eeb3c3c171368187f9f7bf52580f0f10cd4f

+171 -10 lines changed