# サンプルがeiramさんでカワイイヤッター!

S = input()
N = len(S)

alphabets = ''
digits = ''

for i in range(N):
    if 'a' <= S[i] <= 'z':
        alphabets = S[i] + alphabets
    else:
        digits = digits + S[i]

print(alphabets + digits)