letruc = open("3.txt").read()

import string

phrase = ''
i = 2
imax = len(letruc)

while i<imax:
	i = i+1
	if letruc[i-3] in string.uppercase and letruc[i-2] in string.uppercase and letruc[i-1] in string.uppercase and letruc[i+1] in string.uppercase and letruc[i+2] in string.uppercase and letruc[i+3] in string.uppercase and letruc[i] in string.lowercase and letruc[i-4] not in string.uppercase and letruc[i+4] not in string.uppercase:
		phrase = phrase + letruc[i]
print phrase