# Инвертирует строку
from ast import IsNot


def solution(string):
    return string[::-1]


#print(solution("qwerty"))

# ------------------------------------------------------------------------------- #


def unique_in_order(iterable):
    s = set(iterable)
    l = []
    for i in iterable:
        if i in s:
            l.append(i)
            s.remove(i)
    
    return l

    


print(unique_in_order("qwereteyty"))