import re
s = "AC;AC MR;TA;AC MR;AC;AC MR;TA#$@#$;SDA"
print(";".join([x.replace(' ', '') for x in dict.fromkeys(re.findall(r"\w+(?:\s+\w+)*", s))]))
aW1wb3J0IHJlCnMgPSAiQUM7QUMgTVI7VEE7QUMgTVI7QUM7QUMgTVI7VEEjJEAjJDtTREEiCnByaW50KCI7Ii5qb2luKFt4LnJlcGxhY2UoJyAnLCAnJykgZm9yIHggaW4gZGljdC5mcm9ta2V5cyhyZS5maW5kYWxsKHIiXHcrKD86XHMrXHcrKSoiLCBzKSldKSk=