n=gets.to_i
xs=[]
all=0
n.times{
	es=gets.chomp.split(" ")
	all+=es.shift.to_i
	xs<<es
}

x=0
ans=[]
while all>0 do
	n.times{|y|
		next if xs[y].size<=x
		ans<<xs[y][x]
		all-=1
	}
	x+=1
end
puts ans.join(" ")