Preview:
# if order of characters is important

string=input('enter string:')
new=''
for i in string:
    if i not in new:
        new+=i
print(new)

# if order of characters is not important

s=set()
for i in string:
    s.add(i)
lis=''
for i in s:
    lis+=i
print(lis)
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