s = gets.chomp.chars

Point = Struct.new :x, :y
point = Point.new 0, 0

s.each {|c|
    case c
    when 'N'
        point.y += 1
    when 'E'
        point.x += 1
    when 'W'
        point.x -= 1
    when 'S'
        point.y -= 1
    end
}

puts Math.sqrt(point.x ** 2 + point.y ** 2)