n = int(input())
r = list(map(int, input().split()))
rad = []
coun = dict()
j = r[0]
c = 0
for i in r:
    if i == j:
        c += 1
    else:
        coun[j] = c
        rad.append(j)
        j = i
        c = 1
coun[j] = c
rad.append(j)
sorted(rad)
ans = []

while len(rad) >= 3:
    a, b, c = rad[-1], rad[-2], rad[-3]

    while coun[a] * coun[b] * coun[c] != 0:
        ans.append(a)
        ans.append(b)
        ans.append(c)
        coun[a] -= 1
        coun[b] -= 1
        coun[c] -= 1

    if coun[a] == 0:
        rad.remove(a)
    if coun[b] == 0:
        rad.remove(b)
    if coun[c] == 0:
        rad.remove(c)

print(len(ans) // 3)
for i in range(0, len(ans) - 2, 3):
    print(ans[i], ans[i + 1], ans[i + 2])