题解 | #提取不重复的整数#

while True:
    try:
        x=list(input())
        y=x[::-1]
        z=[]
        for i in range(len(y)):
            if y[i] not in z:
                z.append(y[i])
        #print(z)
        for i in range(len(z),0,-1):
            while int(i)==0:
                del(z[i])
        print("".join(z))
    except:
        break