Problem:
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Dice I

Write a program to simulate rolling a dice, which can be constructed by the following net.

As shown in the figures, each face is identified by a different label from 1 to 6.

Write a program which reads integers assigned to each face identified by the label and a sequence of commands to roll the dice, and prints the integer on the top face. At the initial state, the dice is located as shown in the above figures.

Input

In the first line, six integers assigned to faces are given in ascending order of their corresponding labels.

In the second line, a string which represents a sequence of commands, is given. The command is one of 'E', 'N', 'S' and 'W' representing four directions shown in the above figures.

Output

Print the integer which appears on the top face after the simulation.

Constraints

$0 \leq $ the integer assigned to a face $ \leq 100$

$0 \leq $ the length of the command $\leq 100$

Sample Input 1

1 2 4 8 16 32
SE

Sample Output 1

8

You are given a dice where 1, 2, 4, 8, 16 are 32 are assigned to a face labeled by 1, 2, ..., 6 respectively. After you roll the dice to the direction S and then to the direction E, you can see 8 on the top face.

Sample Input 2

1 2 4 8 16 32
EESWN

Sample Output 2

32

Solution in Ruby (judge verdict: Accepted)

class Dice
  def initialize(n, s, e, w, t, b)
    $north = n
    $south = s
    $east = e
    $west = w
    $top = t
    $bottom = b
  end

  def move_north
    north = $north
    south = $south
    top = $top
    bottom = $bottom
    $north = top
    $top = south
    $bottom = north
    $south = bottom
  end

  def move_south
    north = $north
    south = $south
    top = $top
    bottom = $bottom
    $south = top
    $bottom = south
    $north = bottom
    $top = north
  end

  def move_east
    top = $top
    bottom = $bottom
    east = $east
    west = $west
    $east = top
    $bottom = east
    $west = bottom
    $top = west
  end

  def move_west
    top = $top
    bottom = $bottom
    east = $east
    west = $west
    $west = top
    $bottom = west
    $east = bottom
    $top = east
  end

  def execute_orders(orders)
    orders.each do |order|
      if order == "N"
        move_north
      elsif order == "S"
        move_south
      elsif order == "E"
        move_east
      elsif order == "W"
        move_west
      else
        puts "error!"
      end
    end
  end
end

dice_number = gets.chomp.split.map(&:to_i)
t = dice_number[0]
s = dice_number[1]
e = dice_number[2]
w = dice_number[3]
n = dice_number[4]
b = dice_number[5]
input_orders = gets.chomp.to_s
orders = []
size = input_orders.size
for i in 0...size
  orders << input_orders[i]
end

dice = Dice.new(n, s, e, w, t, b)
dice.execute_orders(orders)
puts $top