n = int(input())
setnr = 1

while n:
    names = []
    for _ in range(n):
        names.append(input())

    names_even = [name for i, name in enumerate(names) if i % 2 == 0]
    names_odd = [name for i, name in enumerate(names) if i % 2 == 1][::-1]
    names = names_even + names_odd

    print(f"SET {setnr}")
    for name in names:
        print(name)

    n = int(input())
    setnr += 1