<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def shortcut_app_id(shortcut):
 """ Generates the app id for a given shortcut. Steam uses app ids as a unique identifier for games, but since shortcuts dont have a canonical serverside representation they need to be generated on the fly. The important part about this function is that it will generate the same app id as Steam does for a given shortcut """

  algorithm = Crc(width = 32, poly = 0x04C11DB7, reflect_in = True, xor_in = 0xffffffff, reflect_out = True, xor_out = 0xffffffff)
  crc_input = ''.join([shortcut.exe,shortcut.name])
  high_32 = algorithm.bit_by_bit(crc_input) | 0x80000000
  full_64 = (high_32 << 32) | 0x02000000
  return str(full_64)