/**
 * A Dyslectic worst nightmare. It looks pretty easy, but to write down what you can do easily in your head not so
 * trivial. It turned out a bit more spaghetti if code statements then I liked, but I think this covers all cases.
 */

import kotlin.math.pow

fun main() {
  val (x, y) = readln().split(" ", limit = 2).map { it.toDegrees()}
  when (x) {
    in 0.0..y -> y - x
    else -> x - y
  }.let {
    println(
      when (it) {
        in 0.0..180.0 -> it
        else -> 360.0 - it
      }
    )
  }
}

fun String.toDegrees(): Double {
  return when (length) {
    1 -> when (first()) {
      'N' -> 0.0
      'E' -> 90.0
      'S' -> 180.0
      'W' -> 270.0
      else -> error("invalid")
    }

    2 -> when (this) {
      "NE" -> 45.0
      "SE" -> 135.0
      "SW" -> 225.0
      "NW" -> 315.0
      else -> error("invalid")
    }

    else -> {
      val start = takeLast(2).toDegrees()
      dropLast(2).foldRightIndexed(start) { index, c, acc ->
        val diff = ((90.0 / (2.0.pow(length - 1 - index))))
        acc + when {
          c == 'N' && start == 45.0 -> -diff
          c == 'E' && start == 135.0 -> -diff
          c == 'S' && start == 225.0 -> -diff
          c == 'W' && start == 315.0 -> -diff
          else -> diff
        }
      }
    }

  }
}