lst = [int(i) for i in input().split()]
lst.sort()
c = 1

if len(lst) == 1:
    print('')

else:
    for j in range(0, len(lst) - 1):
        if lst[j] == lst[j+1]:
            c += 1

        else:
            print(lst[j], end = ' ')
            c = 1

    if lst[-1] == lst[-2]:
        print(lst[-1], end = ' ')