import java.io.BufferedReader
import java.io.InputStream
import java.io.InputStreamReader
import java.util.*
import kotlin.math.abs
import kotlin.math.max
import kotlin.math.min

val MOD = 1_000_000_007L

data class Plane(val x: Int, val y: Int)
fun tpe(u: Char): Int {
  return when(u) {
    'U' -> 0
    'R' -> 1
    'D' -> 2
    else -> 3
  }
}
class Solver(stream: InputStream, private val out: java.io.PrintWriter) {
  fun solve() {
    val N = ni()
    val P = Array(4){mutableListOf<Plane>()}
    for (i in 0 until N) {
      val x = ni()
      val y = ni()
      val u = ns()[0]
      P[tpe(u)].add(Plane(x, y))
    }
    if (isDebug) {
      for (i in 0 until 4) {
        debug { P[i].toString() }
      }
    }
    val INF = 1e9.toInt()
    var ans = INF

    val A = Array(400_000 + 10){TreeSet<Int>()}
    val off = 200_000

    // U-R
    for (i in P[1]) {
      A[i.x + i.y].add(i.x)
    }
    for (i in P[0]) {
      val xy = i.x + i.y
      val x = A[xy].lower(i.x)
      if (x != null) {
        ans = min(ans, 2 * (i.x - x))
      }
    }

    // U-L
    for (i in -200_000 .. 200_000) {
      A[off + i].clear()
    }
    for (i in P[3]) {
      A[off + i.x - i.y].add(i.x)
    }
    for (i in P[0]) {
      val xy = off + i.x - i.y
      val x = A[xy].higher(i.x)
      if (x != null) {
        ans = min(ans, 2 * (x - i.x))
      }
    }

    // D-R
    for (i in -200_000 .. 200_000) {
      A[off + i].clear()
    }
    for (i in P[1]) {
      A[off + i.x - i.y].add(i.x)
    }
    for (i in P[2]) {
      val xy = off + i.x - i.y
      val x = A[xy].lower(i.x)
      if (x != null) {
        ans = min(ans, 2 * (i.x - x))
      }
    }

    // D-L
    for (i in 0 .. 400_000) {
      A[i].clear()
    }
    for (i in P[3]) {
      A[i.x + i.y].add(i.x)
    }
    for (i in P[2]) {
      val xy = i.x + i.y
      val x = A[xy].higher(i.x)
      if (x != null) {
        ans = min(ans, 2 * (x - i.x))
      }
    }

    // U-D
    for (i in 0 .. 200_000) {
      A[i].clear()
    }
    for (i in P[2]) {
      A[i.x].add(i.y)
    }
    for (i in P[0]) {
      val y = A[i.x].higher(i.y)
      if (y != null) {
        ans = min(ans, y - i.y)
      }
    }

    // R-L
    for (i in 0 .. 200_000) {
      A[i].clear()
    }
    for (i in P[3]) {
      A[i.y].add(i.x)
    }
    for (i in P[1]) {
      val x = A[i.y].higher(i.x)
      if (x != null) {
        ans = min(ans, x - i.x)
      }
    }

    if (ans == INF) out.println("SAFE")
    else out.println(ans * 5)
  }













































  private val isDebug = try {
    // なんか本番でエラーでる
    System.getenv("MY_DEBUG") != null
  } catch (t: Throwable) {
    false
  }

  private var tokenizer: StringTokenizer? = null
  private val reader = BufferedReader(InputStreamReader(stream), 32768)
  private fun next(): String {
    while (tokenizer == null || !tokenizer!!.hasMoreTokens()) {
      tokenizer = StringTokenizer(reader.readLine())
    }
    return tokenizer!!.nextToken()
  }

  private fun ni() = next().toInt()
  private fun nl() = next().toLong()
  private fun ns() = next()
  private fun na(n: Int, offset: Int = 0): IntArray {
    return map(n) { ni() + offset }
  }
  private fun nal(n: Int, offset: Int = 0): LongArray {
    val res = LongArray(n)
    for (i in 0 until n) {
      res[i] = nl() + offset
    }
    return res
  }

  private fun na2(n: Int, offset: Int = 0): Array<IntArray> {
    val a  = Array(2){IntArray(n)}
    for (i in 0 until n) {
      for (e in a) {
        e[i] = ni() + offset
      }
    }
    return a
  }

  private inline fun map(n: Int, f: (Int) -> Int): IntArray {
    val res = IntArray(n)
    for (i in 0 until n) {
      res[i] = f(i)
    }
    return res
  }

  private inline fun debug(msg: () -> String) {
    if (isDebug) System.err.println(msg())
  }

  private fun debug(a: LongArray) {
    debug { a.joinToString(" ") }
  }

  private fun debug(a: IntArray) {
    debug { a.joinToString(" ") }
  }

  private fun debug(a: BooleanArray) {
    debug { a.map { if (it) 1 else 0 }.joinToString("") }
  }

  private fun debugDim(A: Array<LongArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }
  private fun debugDim(A: Array<IntArray>) {
    if (isDebug) {
      for (a in A) {
        debug(a)
      }
    }
  }

  /**
   * 勝手にimport消されるのを防ぎたい
   */
  private fun hoge() {
    min(1, 2)
    max(1, 2)
    abs(-10)
  }
}

fun main() {
  val out = java.io.PrintWriter(System.out)
  Solver(System.`in`, out).solve()
  out.flush()
}

Measured memory_bytes: 97292