using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.IO;
using System.IO.Pipes;
using System.Linq;
using System.Numerics;
using System.Reflection.Metadata;
using System.Runtime.CompilerServices;
using System.Runtime.InteropServices;
using System.Runtime.Intrinsics.X86;
using System.Text;
using System.Threading;

namespace AtCoder
{
	public class Program
	{
		static void Main()
		{
			var cin = new Scanner();
			int n = cin.Int();

			var pu = new HashMap<int, List<int>>(x => new List<int>());
			var pd = new HashMap<int, List<int>>(x => new List<int>());
			var pr = new HashMap<int, List<int>>(x => new List<int>());
			var pl = new HashMap<int, List<int>>(x => new List<int>());

			var prs = new List<(int x, int y)>();
			var pls = new List<(int x, int y)>();

			var uagari = new HashMap<int, List<int>>(x => new List<int>());
			var usagari = new HashMap<int, List<int>>(x => new List<int>());
			var dagari = new HashMap<int, List<int>>(x => new List<int>());
			var dsagari = new HashMap<int, List<int>>(x => new List<int>());
			for (int i = 0; i < n; i++) {
				int x = cin.Int();
				int y = cin.Int();
				char u = cin.Next()[0];

				switch (u) {
					case 'U':
						pu[x].Add(y);
						uagari[y - x].Add(x);
						usagari[y + x].Add(x);
						break;
					case 'D':
						pd[x].Add(y);
						dagari[y - x].Add(x);
						dsagari[y + x].Add(x);
						break;
					case 'L':
						pl[y].Add(x);
						pls.Add((x, y));
						break;
					case 'R':
						pr[y].Add(x);
						prs.Add((x, y));
						break;
					default:
						break;
				}
			}

			long ans = long.MaxValue;
			foreach (var upos in pu.Keys) {
				if (pd.ContainsKey(upos) == false) {
					continue;
				}

				var dds = pd[upos].OrderBy(x => x).ToArray();
				foreach (var uu in pu[upos]) {
					int ng = -1;
					int ok = dds.Length;
					while (ok - ng > 1) {
						int mid = (ok + ng) / 2;
						if (dds[mid] > uu) {
							ok = mid;
						} else {
							ng = mid;
						}
					}

					if (ok < dds.Length) {
						ans = Math.Min(ans, (dds[ok] - uu) * 5);
					}
				}
			}

			foreach (var rpos in pr.Keys) {
				if (pl.ContainsKey(rpos) == false) {
					continue;
				}

				var lls = pl[rpos].OrderBy(x => x).ToArray();
				foreach (var rr in pr[rpos]) {
					int ng = -1;
					int ok = lls.Length;
					while (ok - ng > 1) {
						int mid = (ok + ng) / 2;
						if (lls[mid] > rr) {
							ok = mid;
						} else {
							ng = mid;
						}
					}

					if (ok < lls.Length) {
						ans = Math.Min(ans, (lls[ok] - rr) * 5);
					}
				}
			}

			foreach (var key in dagari.Keys) {
				dagari[key].Sort();
			}

			foreach (var key in dsagari.Keys) {
				dsagari[key].Sort();
			}

			foreach (var key in uagari.Keys) {
				uagari[key].Sort();
			}

			foreach (var key in usagari.Keys) {
				usagari[key].Sort();
			}

			foreach (var rpos in prs) {
				int agari = rpos.y - rpos.x;
				int sagari = rpos.y + rpos.x;

				if (dagari.ContainsKey(agari)) {
					var da = dagari[agari];
					int ng = -1;
					int ok = da.Count;
					while (ok - ng > 1) {
						int mid = (ok + ng) / 2;
						if (da[mid] > rpos.x) {
							ok = mid;
						} else {
							ng = mid;
						}
					}

					if (ok < da.Count) {
						ans = Math.Min(ans, (da[ok] - rpos.x) * 10);
					}
				}

				if (usagari.ContainsKey(sagari)) {
					var ds = usagari[sagari];
					int ng = -1;
					int ok = ds.Count;
					while (ok - ng > 1) {
						int mid = (ok + ng) / 2;
						if (ds[mid] > rpos.x) {
							ok = mid;
						} else {
							ng = mid;
						}
					}

					if (ok < ds.Count) {
						ans = Math.Min(ans, (ds[ok] - rpos.x) * 10);
					}
				}
			}

			foreach (var lpos in pls) {
				int agari = lpos.y - lpos.x;
				int sagari = lpos.y + lpos.x;

				if (uagari.ContainsKey(agari)) {
					var ua = uagari[agari];
					int ok = -1;
					int ng = ua.Count;
					while (ng - ok > 1) {
						int mid = (ok + ng) / 2;
						if (ua[mid] < lpos.x) {
							ok = mid;
						} else {
							ng = mid;
						}
					}

					if (ok >= 0) {
						ans = Math.Min(ans, (lpos.x - ua[ok]) * 10);
					}
				}

				if (dsagari.ContainsKey(sagari)) {
					var ds = dsagari[sagari];
					int ok = -1;
					int ng = ds.Count;
					while (ng - ok > 1) {
						int mid = (ok + ng) / 2;
						if (ds[mid] < lpos.x) {
							ok = mid;
						} else {
							ng = mid;
						}
					}

					if (ok >= 0) {
						ans = Math.Min(ans, (lpos.x - ds[ok]) * 10);
					}
				}
			}

			if (ans == long.MaxValue) {
				Console.WriteLine("SAFE");
			} else {
				Console.WriteLine(ans);
			}
		}
	}

	public struct ModInt
	{
		public const long P = 1000000007;
		//public const long P = 998244353;

		public static ModInt Inverse(ModInt value) => Pow(value, P - 2);
		public static ModInt Pow(ModInt value, long k) => Pow(value.value_, k);
		public static ModInt Pow(long value, long k)
		{
			long ret = 1;
			for (k %= P - 1; k > 0; k >>= 1, value = value * value % P) {
				if ((k & 1) == 1) {
					ret = ret * value % P;
				}
			}
			return new ModInt(ret);
		}

		private long value_;

		public ModInt(long value)
			=> value_ = value;
		public ModInt(long value, bool mods)
		{
			if (mods) {
				value %= P;
				if (value < 0) {
					value += P;
				}
			}

			value_ = value;
		}

		public static ModInt operator +(ModInt lhs, ModInt rhs)
		{
			lhs.value_ = (lhs.value_ + rhs.value_) % P;
			return lhs;
		}
		public static ModInt operator +(long lhs, ModInt rhs)
		{
			rhs.value_ = (lhs + rhs.value_) % P;
			return rhs;
		}
		public static ModInt operator +(ModInt lhs, long rhs)
		{
			lhs.value_ = (lhs.value_ + rhs) % P;
			return lhs;
		}

		public static ModInt operator -(ModInt lhs, ModInt rhs)
		{
			lhs.value_ = (P + lhs.value_ - rhs.value_) % P;
			return lhs;
		}
		public static ModInt operator -(long lhs, ModInt rhs)
		{
			rhs.value_ = (P + lhs - rhs.value_) % P;
			return rhs;
		}
		public static ModInt operator -(ModInt lhs, long rhs)
		{
			lhs.value_ = (P + lhs.value_ - rhs) % P;
			return lhs;
		}

		public static ModInt operator *(ModInt lhs, ModInt rhs)
		{
			lhs.value_ = lhs.value_ * rhs.value_ % P;
			return lhs;
		}
		public static ModInt operator *(long lhs, ModInt rhs)
		{
			rhs.value_ = lhs * rhs.value_ % P;
			return rhs;
		}
		public static ModInt operator *(ModInt lhs, long rhs)
		{
			lhs.value_ = lhs.value_ * rhs % P;
			return lhs;
		}

		public static ModInt operator /(ModInt lhs, ModInt rhs)
		{
			long exp = P - 2;
			while (exp > 0) {
				if (exp % 2 > 0) {
					lhs *= rhs;
				}

				rhs *= rhs;
				exp /= 2;
			}

			return lhs;
		}

		public static implicit operator ModInt(long n) => new ModInt(n, true);
		public long ToLong() => value_;
		public override string ToString() => value_.ToString();
	}

	public class HashMap<TKey, TValue> : Dictionary<TKey, TValue>
	{
		private readonly Func<TKey, TValue> initialzier_;
		public HashMap(Func<TKey, TValue> initialzier)
			: base()
		{
			initialzier_ = initialzier;
		}

		public HashMap(Func<TKey, TValue> initialzier, int capacity)
			: base(capacity)
		{
			initialzier_ = initialzier;
		}

		new public TValue this[TKey key]
		{
			get
			{
				if (ContainsKey(key) == false) {
					base[key] = initialzier_(key);
				}

				return base[key];
			}

			set { base[key] = value; }
		}
	}

	public static class Helper
	{
		public static void UpdateMin<T>(ref T target, T value) where T : IComparable<T>
			=> target = target.CompareTo(value) > 0 ? value : target;

		public static void UpdateMin<T>(ref T target, T value, Action<T> onUpdated) where T : IComparable<T>
		{
			if (target.CompareTo(value) > 0) {
				target = value;
				onUpdated(value);
			}
		}

		public static void UpdateMax<T>(ref T target, T value) where T : IComparable<T>
			=> target = target.CompareTo(value) < 0 ? value : target;
		public static void UpdateMax<T>(ref T target, T value, Action<T> onUpdated) where T : IComparable<T>
		{
			if (target.CompareTo(value) < 0) {
				target = value;
				onUpdated(value);
			}
		}

		public static T[] Array<T>(int n, Func<int, T> init)
			=> Enumerable.Range(0, n).Select(x => init(x)).ToArray();
		public static List<T> List<T>(int n, Func<int, T> init)
			=> Enumerable.Range(0, n).Select(x => init(x)).ToList();
		public static T[,] Array2<T>(int n, int m, T init)
		{
			var array = new T[n, m];
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					array[i, j] = init;
				}
			}

			return array;
		}

		public static T[,] Array2<T>(int n, int m, Func<int, int, T> initializer)
		{
			var array = new T[n, m];
			for (int i = 0; i < n; i++) {
				for (int j = 0; j < m; j++) {
					array[i, j] = initializer(i, j);
				}
			}

			return array;
		}

		public static T[,,] Array3<T>(int n1, int n2, int n3, T init)
		{
			var array = new T[n1, n2, n3];
			for (int i1 = 0; i1 < n1; i1++) {
				for (int i2 = 0; i2 < n2; i2++) {
					for (int i3 = 0; i3 < n3; i3++) {
						array[i1, i2, i3] = init;
					}
				}
			}

			return array;
		}

		private static readonly int[] delta4_ = { 1, 0, -1, 0, 1 };
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void DoAt4(int i, int j, int imax, int jmax, Action<int, int> action)
		{
			for (int dn = 0; dn < 4; dn++) {
				int d4i = i + delta4_[dn];
				int d4j = j + delta4_[dn + 1];
				if ((uint)d4i < (uint)imax && (uint)d4j < (uint)jmax) {
					action(d4i, d4j);
				}
			}
		}

		private static readonly int[] delta8_ = { 1, 0, -1, 0, 1, 1, -1, -1, 1 };
		[MethodImpl(MethodImplOptions.AggressiveInlining)]
		public static void DoAt8(int i, int j, int imax, int jmax, Action<int, int> action)
		{
			for (int dn = 0; dn < 8; dn++) {
				int d8i = i + delta8_[dn];
				int d8j = j + delta8_[dn + 1];
				if ((uint)d8i < (uint)imax && (uint)d8j < (uint)jmax) {
					action(d8i, d8j);
				}
			}
		}
	}

	public class Scanner
	{
		private readonly char[] delimiter_ = new char[] { ' ' };
		private readonly string filePath_;
		private readonly Func<string> reader_;
		private string[] buf_;
		private int index_;

		public Scanner(string file = "")
		{
			if (string.IsNullOrWhiteSpace(file)) {
				reader_ = Console.ReadLine;
			} else {
				filePath_ = file;
				var fs = new StreamReader(file);
				reader_ = fs.ReadLine;
			}
			buf_ = new string[0];
			index_ = 0;
		}

		public string NextLine() => reader_();
		public string Next()
		{
			if (index_ < buf_.Length) {
				return buf_[index_++];
			}

			string st = reader_();
			while (st == "") {
				st = reader_();
			}

			buf_ = st.Split(delimiter_, StringSplitOptions.RemoveEmptyEntries);
			if (buf_.Length == 0) {
				return Next();
			}

			index_ = 0;
			return buf_[index_++];
		}

		public int Int() => int.Parse(Next());
		public long Long() => long.Parse(Next());
		public double Double() => double.Parse(Next());

		public int[] ArrayInt(int N, int add = 0)
		{
			int[] Array = new int[N];
			for (int i = 0; i < N; i++) {
				Array[i] = Int() + add;
			}
			return Array;
		}

		public long[] ArrayLong(int N, long add = 0)
		{
			long[] Array = new long[N];
			for (int i = 0; i < N; i++) {
				Array[i] = Long() + add;
			}
			return Array;
		}

		public double[] ArrayDouble(int N, double add = 0)
		{
			double[] Array = new double[N];
			for (int i = 0; i < N; i++) {
				Array[i] = Double() + add;
			}
			return Array;
		}

		public void Save(string text)
		{
			if (string.IsNullOrWhiteSpace(filePath_)) {
				return;
			}

			File.WriteAllText(filePath_ + "_output.txt", text);
		}
	}

	public static class Extensions
	{
		public static string Join<T>(this IEnumerable<T> values, string separator = "")
			=> string.Join(separator, values);
	}
}


Measured memory_bytes: 149316