Leer un numero entero positivo, eliminar los dos dígitos que más veces se repiten e imprimir el resto

def most_repeated(a):
  b = list(str(a))
  #print(type(b))
  c = []
  for i in b:
    c.append(b.count(i))
  #print(c)
  d = []
  for i in b:
    if b.count(i) == max(c):
      d.append(i)
  #print(d)
  for i in sorted(d) [:2]:
    a = str(a).replace(i, "")
  print(a)
    
most_repeated(233799)
most_repeated(3332215)
most_repeated(3334455)
most_repeated(33335577)
most_repeated(33335578)
most_repeated(33345678)
most_repeated(3333556778)