Python Caesars

osalt = ".,!? ABCDEFGHIJKLMNOPQRSTUVWXYZ"
def decode():
  int = 0
  counter = 0
  msg = requestString("What would you like Decoded?").upper()
  print "Now decoding, '"+msg+"'."
  print "==========Please Wait=========="
  while (int < len(osalt)):
    dmsg = ""
    nsalt = ""
    int += 1
    int2 = 0
    shift = int-1
    while int2 <= len(osalt):
      if int2+shift < len(osalt):
        nsalt += osalt[int2+shift]
      else:
        nsalt += osalt[int2+shift-len(osalt)-1]
      int2 += 1
    for letter in msg:
      index = nsalt.find(letter)
      dmsg += nsalt[index]
    print dmsg
    counter += 1
  print counter
decode()