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nbParticipants = int(input())
nbEquipes = nbParticipants // 2
composEquipe = [0] * nbParticipants
for loop in range(nbParticipants):
composEquipe[loop] = int(input())
#print()
composEquipe.sort()
loopMax = nbParticipants - 1
for loop in range(nbEquipes):
print("{} {}".format(composEquipe[loop], composEquipe[loopMax]))
loopMax = loopMax - 1