input: def solve_hanoi(disks, source, spare, target):
      """
      Solve the Towers of Hanoi puzzle for the given number of disks and their initial positions.
      
      Example:
      solve_hanoi([(1, "A"), (2, "A"), (3, "A")], [(1, "A"), (2, "A"), (3, "A")], [], [])
      
      Output:
      Moving disk 1 from A to B
      Moving disk 2 from A to C
      Moving disk 1 from B to C
      Moving disk 3 from A to B
      Moving disk 1 from C to A
      Moving disk 2 from C to B
      Moving disk 1 from A to B
      """
      def hanoi(n, source, spare, target):
          if n == 1:
              disk = source.pop(0)
              print("Moving disk {0} from {1} to {2}".format(disk[0], disk[1], target[1]))
              target.insert(0, disk)
          else:
              hanoi(n-1, source, target, spare)
              disk = source.pop(0)
              print("Moving disk {0} from {1} to {2}".format(disk[0], disk[1], target[1]))
              target.insert(0, disk)
              hanoi(n-1, spare, source, target)
      
      hanoi(len(disks), source, spare, target)
output:     def solve_hanoi(disks, source, spare, target):
          """
          Solve the Towers of Hanoi puzzle for the given number of disks and their initial positions.
          
          Example:
          solve_hanoi([(1, "A"), (2, "A"), (3, "A")], [(1, "A"), (2, "A"), (3, "A")], [], [])
          
          Output:
          Moving disk 1 from A to B
          Moving disk 2 from A to C
          Moving disk 1 from B to C
          Moving disk 3 from A to B
          Moving disk 1 from C to A
          Moving disk 2 from C to B
          Moving disk 1 from A to B
          """
          def hanoi(n, source, spare, target):
              if n == 1:
                  disk = source.pop(0)
                  print("Moving disk {0} from {1} to {2}".format(disk[0], disk[1], target[1]))
                  target.insert(0, disk)
              else:
                  hanoi(n-1, source, target, spare)
                  disk = source.pop(0)
                  print("Moving disk {0} from {1} to {2}".format(disk[0], disk[1], target[1]))
                  target.insert(0, disk)
                  hanoi(n-1, spare, source, target)
          
          hanoi(len(disks), source, spare, target)