func main()
	var n: int :: cui@inputInt()
	var map: dict<int, int> :: #dict<int, int>
	for loop(1, n)
		var s: []char :: cui@input()
		for i(1, ^s - 1)
			if(s[i] < s[i - 1])
				skip loop
			end if
		end for
		var cStart: int :: s[0] $ int - 'a' $ int
		var cEnd: int :: s[^s - 1] $ int - 'a' $ int
		var len: int :: ^s
		
		var id: int :: cStart + cEnd * 26
		if(cStart = cEnd)
			do map.add(id, map.get(id, &) + len)
		else
			do map.add(id, [map.get(id, &), len].max())
		end if
	end for
	
	var dp: []int :: #[26]int
	for cs(0, 25)
		for ce(cs, 25)
			do dp[ce] :: [dp[ce], dp[cs] + map.get(cs + ce * 26, &)].max()
		end for
	end for
	
	var ans: int :: dp[25]
	do cui@print("\{ans}\n")
end func