def run(seq):
seq= list(seq)
a = []
inds = []
for i,_s in enumerate(seq):
if _s.isalpha():
a.append(_s)
inds.append(i)
b = sorted(a, key=str.lower)
d = seq
for i,_i in enumerate(inds):
d[_i] = b[i]
d = "".join(d)
return d
seq = input().strip()
print(run(seq))