import base64

charset = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'

def get_padding(s):
    s = s[-4:]
    if '=' not in s:
        res = ''
    elif s[2] == '=':
        v = charset.index(s[1]) & 0x0F
        res = bin(v)[2:].rjust(4, '0')
    elif s[3] == '=':
        v = charset.index(s[2]) & 3
        res = bin(v)[2:].rjust(2, '0')
    return res

lines = open('stego.txt').readlines()
bmsg = ''

for l in lines:
    l1 = l.strip()
    l2 = base64.b64decode(l1)
    if (l1 != l2):
        bmsg += get_padding(l1)

msg = ''
for i in range(0, len(bmsg), 8):
    msg += chr(int(bmsg[i:i+8], 2))
print msg