#!/usr/bin/env ruby

def get_depth_to(hsh, elm, to)
  n = 0
  loop do
    break if elm == to
    n += 1
    elm = hsh[elm]
  end
  n
end

def get_hier(hsh, elm)
  hier = [elm]
  loop do
    break if elm == "COM"
    elm = hsh[elm]
    hier << elm
  end
  hier
end

input = $stdin.readlines.map(&:strip).map{|x|x.split(")")}

objects = {}

input.each do |line|
  objects[line[1]] = line[0]
end

me_hier = get_hier(objects, "YOU")
santa_hier = get_hier(objects, "SAN")

lca = nil
me_hier.each do |obj|
  if santa_hier.include?(obj) then
    lca = obj
    break
  end
end

puts get_depth_to(objects, "YOU", lca) + get_depth_to(objects, "SAN", lca) - 2