zxczvcxzvqerqz

mylist1=[]   #Bulunan karakterler bu listeye atilacak.


def before(location):
#Her bulunan kucuk karakter icin, onceki 1. 2. ve 3. karakterin buyuk harfli olup olmadigini kontrol ediyor.
    if sentence[location-1].isupper() is True:
        if sentence[location-2].isupper() is True:
            if sentence[location-3].isupper() is True:
                return True
    else:
        return False

#Ayni sekilde, her bulunan kucuk karakterin sonraki 1. 2. ve 3. karakterinin buyuk harfli olup olmadigini kontrol ediyor.
def after(location):
    if sentence[location+1].isupper() is True:
        if sentence[location+2].isupper() is True:
            if sentence[location+3].isupper() is True:
                return True
    else:
        return False
#Bu dongu de stringi tek tek karakterlerine ayiriyor, karakteri "char" olarak kaydediyor, konumunu da "index".

for index,char in enumerate(sentence):
#   print index
#   print char
#   if char.islower() is True: #bu alternatif kod, yani alttaki yerine bunu da denedim.
#       if before(index) is True:
#           if after(index) is True:
#               mylist.append(char)

#bu da diger secenek
    if char.islower() is True:
        if sentence[index-1].isupper() and sentence[index-2].isupper() and sentence[index-3].isupper() is True:
            if sentence[index+1].isupper() and sentence[index+2].isupper() and sentence[index+3].isupper() is True:
                mylist1.append(char)



#bunlari test icin yazmistim, konuyla pek alakasi yok aslında. Ama bu testler dogru donduruyor.
#       print "%s is lowercase\n and it's index is %s" %(char, index)
#       print "previous character is: %s" %(sentence[index-1])
#   elif char.isupper():
#       print "%s is uppercase\n and it's index is %s" %(char, index)
#       print "previous character is: %s" %(sentence[index-1])

print mylist1