ch6 ex5

response=""
ids=[]
while not response=="exit":
  response=input("Enter email ids")
  if response.count('@')==1 and response.count('.')==1:
    ids.append(response)
  elif response=="exit":
    print("exiting")
  else:
    print("enter a valid email id")

text="".join(ids)
print("gmail total occurence",text.count("gmail"))