题解 | #字符串组合#

str = input().strip()
a = list(set(str))
a.sort()
len_a = len(str)
c = []
for j in range(2,len_a):
    b = set()
    for i in range(len_a-1):
        if (i+j)<=len_a:
            b.add(str[i:i+j])
    b = list(b)
    b.sort()
    c+=b

res = a+c
res.append(str)

result = ""
for i in res:
    result = result+" "+ i

print(result.strip(" "))