#
# b64enc.py - encoder
#
import sys

tbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

print "Type in a line, then press ENTER."
l = sys.stdin.readline()
l = l[:-1]
f = 0
p = 0
for c in l:
	if p == 0:
		f |= ord(c)
		p = 1
	elif p == 1:
		f |= ord(c)<<2
		p = 2
	else:
		f |= ord(c)<<4
		p = 0
	sys.stdout.write(tbl[f & 0x3F])
	f >>= 6
	if p == 0:
		sys.stdout.write(tbl[f & 0x3F])
		f >>= 6

sys.stdout.write(tbl[f & 0x3F])
print ""

#
# b64dec.py - decoder
#
import sys

rtbl = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/"

print "Type in a line, then press ENTER."
l = sys.stdin.readline()
l = l[:-1]
f = 0
p = 0
for c in l:
	i = 0
	while rtbl[i] != c and i < len(rtbl):
		i += 1
	if p == 0:
		f = i
		p = 1
	elif p == 1:
		f |= i<<6
		p = 2
	elif p == 2:
		f |= i<<4
		p = 3
	else:
		f |= i<<2
		p = 0
	if p != 1:
		sys.stdout.write(chr(f & 0xFF))
		f >>= 8
print ""