import sys n = input() b = [] count = 1 z = "" for i in n: b.append(i) c = "".join(b).split(" ") d = "".join(c) # 合并后的字符串 d_uneven = d[0::2] # dca d_even = d[1::2] # efb e_uneven = sorted(d_uneven) # ['a', 'c', 'd'] e_even = sorted(d_even) # ['b', 'e', 'f'] for i in e_even: e_uneven.insert(count, i)...