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#!/opt/local/bin/python
#
# See ../README.md
#
#
# Run as: python ch-2.py < input-file
#
import fileinput
NR_OF_DIGITS = 10
for line in fileinput . input ():
#
# Parse the input, count digits
#
digits = []
for d in range (NR_OF_DIGITS):
digits . append (0)
for d in line . split ():
d = int (d)
digits [d] = digits [d] + 1
#
# Find the smallest even number
#
last = -1
for d in range (NR_OF_DIGITS - 2, -1, -2):
if digits [d] > 0:
last = d
#
# If we don't have an even number, skip
#
if last < 0:
continue
digits [last] = digits [last] - 1
#
# Print the rest of the digits, highest to lowest
#
for d in range (NR_OF_DIGITS - 1, 0, -1):
for i in range (digits [d]):
print (d, end = '')
print (last)
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