题解 | #提取不重复的整数#

字符串2.

while True:
    try:
        a = int(input())
        s = str(a)[::-1]
        l = []
        res = ''
        for i in s:
            if i not in l:
                l.append(i)
        for i in l:
            res+=i
        print(res)
    except:
        break