s = input()
path = s.split("!")


res = []
for i in range(len(path)):
    adj = []
    if i > 0:
        adj.append(path[i - 1].lower())
    if i < len(path) - 1:
        adj.append(path[i + 1].lower())
    for j in range(i):
        if path[j].lower() != path[i].lower():
            continue
        ok = False
        if j > 0 and path[j - 1].lower() in adj:
            ok = True
        if j < len(path) - 1 and path[j + 1].lower() in adj:
            ok = True
        if ok:
            while j in res:
                res.pop()
    res.append(i)

print("!".join(map(lambda i: path[i], res)))