text: def checkio(str_number, radix):
      try:
          return int(str_number, radix)
      except ValueError:
          return -1
  
  print checkio("AF", 16) == 175, "Hex"
  print checkio("101", 2) == 5, "Bin"
  print checkio("101", 5) == 26, "5 base"
  print checkio("Z", 36) == 35, "Z base"
  print checkio("AB", 10) == -1, "B > A > 10"
  