/**
 * 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 {
  if(length == 1) {
    return when(first()) {
      'N' -> 0.0
      'E' -> 90.0
      'S' -> 180.0
      'W' -> 270.0
      else -> error("invalid")
    }
  }
  val first = first()
  val last = last()
  return foldRightIndexed(0.0) { index, c, acc ->
    if (index == 0) {
      acc + when {
        c == 'N' && last == 'E' -> 0.0
        c == 'N' && last == 'W' -> 270.0
        c == 'S' && last == 'E' -> 90.0
        c == 'S' && last == 'W' -> 180.0
        else -> error("Invalid")
      }
    } else {
      val diff = (90.0 / (2.0.pow(length - index)))
      acc + when {
        diff == 45.0 -> diff
        c == 'N' && first == 'N' && last == 'E' -> -diff
        c == 'S' && first == 'E' && last == 'E' -> -diff
        c == 'S' && first == 'S' && last == 'W' -> -diff
        c == 'N' && first == 'W' && last == 'W' -> -diff
        else -> diff
      }
    }
  }
}