562 B | 562 chars
import sys
from math import sqrt, pi, sin, factorial, ceil, floor
from decimal import Decimal
BLANK = " "
# inp = input
inp = lambda : sys.stdin.readline()[:-1].strip()
mii = lambda x = BLANK : [*map(int,inp().split(x))]
mfi = lambda x = BLANK : [*map(float,inp().split(x))]
ii = lambda : int(inp())
fi = lambda : float(inp())
p = print
def solve():
s = list(input())
a = sorted(s[:3])
b = sorted(s[3:], reverse=True)
for i in range(3):
p(end=a[i]+b[i])
if __name__ == "__main__":
tc = 1
for t in range(1, tc+1):
ret = solve()