# Open the file with the encoded message and make it into a string

file = open('3.txt')

messy_string = file.read()

file.close()

# Create two separate alphabets for matching

small = "abcdefghijklmnopqrstuvwxyz"

cap = small.upper()

# Look at each letter, if the three before, and three after, are capital letters

# Skip the first and last three

max_index = len(messy_string)-6

found_matches = ""

for index in range(max_index):

if messy_string[index] in small:

if messy_string[index-1] in cap:

if messy_string[index-2] in cap:

if messy_string[index-3] in cap:

if messy_string[index-4] in small:

if messy_string[index+1] in cap:

if messy_string[index+2] in cap:

if messy_string[index+3] in cap:

if messy_string[index+4] in small:

found_matches += (messy_string[index])

print(found_matches)

print("done")