L=[int(x) for x in input().split()]
h={}
for i in L:
    if i in h:
        h[i]+=1
    else:
        h[i]=1
maxj=0
maxi=0
for j in h.values():
    if j>maxj:
        maxj=j
print(maxj,end=' ')
print(*(sorted(list(h))[::-1]))

L = [int(x) for x in input().split()]
h = {}
for i in L:
    h[i] = h.get(i, 0) + 1
print(max(h.values()), end=' ')
print(*(sorted(h.keys(), reverse=True)))