import os

def int2set(array): 
    out1 = []
    out2 = ""
    for i in range(len(array)):
        if array[i] not in out1:
            out1.append(array[i])      
    for i in range(len(out1)-1 , -1 , -1):
        if i == len(out1)-1 and out1[i] == '0' :
            continue
        else:
            out2 = out2 + str(out1[i])
    return out2

s = list("98766730")
a = int2set(array = s)
print (a)