using System;
using System.Collections.Generic;

class Program
{
static void Main()
{
int N = int.Parse(Console.ReadLine());
var graph = new Dictionary<string, List<string>>();
var indegrees = new Dictionary<string, int>();


for (int i = 0; i < N; i++)
{
var edge = Console.ReadLine().Split();
string from = edge[0];
string to = edge[1];

if (!graph.ContainsKey(from))
graph[from] = new List<string>();
graph[from].Add(to);


if (!indegrees.ContainsKey(from))
indegrees[from] = 0;
if (!indegrees.ContainsKey(to))
indegrees[to] = 0;
indegrees[to]++;
}


var words = Console.ReadLine().Split();


var levels = new Dictionary<string, int>();
var queue = new Queue<string>();


foreach (var node in indegrees.Keys)
{
if (indegrees[node] == 0)
{
levels[node] = 1; // Root level is 1
queue.Enqueue(node);
}
}

while (queue.Count > 0)
{
var current = queue.Dequeue();
int currentLevel = levels[current];

if (graph.ContainsKey(current))
{
foreach (var neighbor in graph[current])
{
if (!levels.ContainsKey(neighbor))
{
levels[neighbor] = currentLevel + 1;
queue.Enqueue(neighbor);
}
indegrees[neighbor]--;
if (indegrees[neighbor] == 0 && !levels.ContainsKey(neighbor))
{
queue.Enqueue(neighbor);
}
}
}
}


int totalValue = 0;

foreach (var word in words)
{
if (levels.ContainsKey(word))
{
totalValue += levels[word];
}
else
{
totalValue += -1;
}
}


Console.Write(totalValue);
}
}
String Puzzle
C+

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