re

import fileinput
import re
strings = []
for s in fileinput.input():
    if len(s) == 1: break
    strings.append(s.strip())

for string in strings:
    result = re.findall(r'cat', string)
    if (len(result) >= 2): print (string)




import re

strings=[]
i = True
while i:
   i = input()
   if i: strings.append(i)

for string in strings:
    result = re.findall(r'cat', string)
    if (len(result) >= 2): print (string)