def AZ(s=None):
 if (not s):
  return uppercase
 t = (type(s) is str)
 if t:
  s = [s]
 rv = [check_and_join(i.upper().split(), uppercase, filter=True) for i in s]
 if t:
  return rv[0]
 return rv

def AZ ( s = None ) : if ( not s ) : return uppercase t = ( type ( s ) is str ) if t : s = [ s ] rv = [ check_and_join ( i . upper ( ) . split ( ) , uppercase , filter = True ) for i in s ] if t : return rv [ 0 ] return rv
return the letters of s in uppercase .