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))