def higher(text):
  text = text.replace(" ", "")
  count = 0
  for char in text:
    current_count = text.count(char)
    if current_count > count:
      count = current_count
      last = char
  return text.replace(last, "")

print(higher("uk aaaa aaaa eeee iiii eeee iiii ku"))
print(higher("otro texto"))

// varias veces el mismo texto
print(higher(higher("uk aaaa aaaa eeee iiii eeee iiii ku")))
print(higher(higher(higher("uk aaaa aaaa eeee iiii eeee iiii ku"))))