import kotlin.math.min

val MOD = 1_000_000_007

fun main() {
  val (N) = readInts()
  val S = Array(N){ readLine()!!}
  val lcps = mutableListOf<Pair<Int, Int>>()
  for (i in 0 until N - 1) {
    var l = 0
    val mx = min(S[i].length, S[i + 1].length)
    while(l < mx && S[i][l] == S[i + 1][l]) l++
    lcps.add(Pair(i, l))
  }
  lcps.sortBy { it.second }
  val t = sortedSetOf<Int>()
  t.add(-1)
  t.add(N - 1)
  var ans = 0L
  S.forEach { ans += it.length }

  for (lcp in lcps) {
    val i = lcp.first
    val l = (i - t.lower(i)!! - 1).toLong()
    val r = (t.higher(i)!! - i - 1).toLong()
    var lensum = (l + 1) * (r + 1) * 2
    lensum += (l + 1) * r * (r + 1) / 2
    lensum += l * (l + 1) / 2 * (r + 1)
    ans += lensum * lcp.second
    debug{"l:$l r:$r"}
    t.add(i)
  }
  println(ans)
}

private val isDebug = try {
  // なんか本番でエラーでる
  System.getenv("MY_DEBUG") != null
} catch (t: Throwable) {
  false
}

private fun readLn() = readLine()!!
private fun readInt() = readLn().toInt()
private fun readStrings() = readLn().split(" ")
private fun readInts() = readStrings().map { it.toInt() }.toIntArray()
private fun readLongs() = readStrings().map { it.toLong() }.toLongArray()
private inline fun debug(msg: () -> String) {
  if (isDebug) System.err.println(msg())
}
private fun debug(a: LongArray) {
  debug{a.joinToString(" ")}
}
private fun debug(a: IntArray) {
  debug{a.joinToString(" ")}
}
private fun debug(a: BooleanArray) {
  debug{a.map{if(it) 1 else 0}.joinToString("")}
}
private fun debugDim(A: Array<IntArray>) {
  if (isDebug) {
    for (a in A) {
      debug(a)
    }
  }
}