题解 | #提取不重复的整数#

demo_str=input()
demo_list=[]
demo_str1=""
for i in range(len(demo_str)):
    demo_str1=demo_str[i]+demo_str1
for i in demo_str1:
    if i not in demo_list:
        demo_list.append(i)
demo_str=""
for i in range(len(demo_list)):
    demo_str=demo_str+demo_list[i]
print(int(demo_str))