l = list(input()) s = set(l) d = dict() for i in s: d[i] = l.count(i) n = min(d.values()) for i in d.keys(): while i in l and d[i] == n: l.remove(i) print("".join(l))
l = list(input()) s = set(l) d = dict() for i in s: d[i] = l.count(i) n = min(d.values()) for i in d.keys(): while i in l and d[i] == n: l.remove(i) print("".join(l))