While Loop M.E. - 03.Stream of letters

letter = ""
word = ""

c_count = 0
o_count = 0
n_count = 0

while letter != "End":
  letter = input()
  alphabetic = letter.isalpha()
  if alphabetic:
   if letter == "End":
      break

   if letter == "n":
      n_count += 1
   elif letter == "o":
      o_count += 1
   elif letter == "c":
      c_count += 1

   if letter == "n" and n_count > 1:
      word += letter

   elif letter == "c" and c_count > 1:
      word += letter

   elif letter == "o" and o_count > 1:
      word += letter

   elif letter != "c" and letter != "n" and letter != "o":
      word += letter
   if c_count >= 1 and o_count >= 1 and n_count >= 1:
      print(word, end=" ")
      c_count = 0
      o_count = 0
      n_count = 0
      word = ""