while True:
    try:
        n = int(input())
        numeros = []

       # if n == 0: break

        numeros = list(map(int, input().split()))

        aux = 0
        amores = []

        while len(amores) < 2:
            aux = numeros[0]
            numeros.pop(0)
            if aux in numeros:
                numeros.remove(aux)
            else:
                amores.append(aux)

        amores = sorted(amores)
        print('{} {}'.format(amores[0], amores[1]))
    except EOFError:
        break