using System;
using System.Collections.Generic;
using System.Linq;
using System.IO;
using System.Text;
using Point = System.Tuple<double, double>;

class Program
{
    const int M = 1000000007;
    const double eps = 1e-9;
    static int[] dd = { 0, 1, 0, -1, 0 };
    static int[] ddd = { 1, 1, -1, -1, 1};
    static void Main()
    {
        var sw = new StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        var sc = new Scan();
        var d = new int[2][];
        d[0] = new int[]{ 1, 2, 1, -2, -1, 2, -1, -2, 1 };
        d[1] = ddd;
        int h, w;
        sc.Multi(out h, out w);
        var dist = new int[h][][];
        var s = new string[h];
        int si = 0, sj = 0, gi = 0, gj = 0;
        for (int i = 0; i < h; i++)
        {
            dist[i] = new int[w][];
            s[i] = sc.Str;
            for (int j = 0; j < w; j++)
            {
                dist[i][j] = new int[2];
                dist[i][j][0] = M;
                dist[i][j][1] = M;
                if (s[i][j] == 'S')
                {
                    si = i;
                    sj = j;
                }
                if (s[i][j] == 'G')
                {
                    gi = i;
                    gj = j;
                }
            }
        }
        var qi = new Queue<int>();
        var qj = new Queue<int>();
        var qk = new Queue<int>();
        dist[si][sj][0] = 0;
        qi.Enqueue(si);
        qj.Enqueue(sj);
        qk.Enqueue(0);
        while (qi.Any())
        {
            int pi = qi.Dequeue(), pj = qj.Dequeue(), pk = qk.Dequeue();
            for (int i = 0; i < d[pk].Length - 1; i++)
            {
                int ti = pi + d[pk][i], tj = pj + d[pk][i + 1];
                if (0 <= ti && ti < h && 0 <= tj && tj < w)
                {
                    var tk = s[ti][tj] == 'R' ? 1 - pk : pk;
                    if (dist[ti][tj][tk] <= dist[pi][pj][pk] + 1) continue;
                    
                    dist[ti][tj][tk] = dist[pi][pj][pk] + 1;
                    qi.Enqueue(ti);
                    qj.Enqueue(tj);
                    qk.Enqueue(tk);
                }
            }
        }
        var ans = Math.Min(dist[gi][gj][0], dist[gi][gj][1]);
        sw.WriteLine(ans < M ? ans : -1);
        sw.Flush();
    }
    
    static void swap<T>(ref T a, ref T b) { var t = a; a = b; b = t; }

    static T[] copy<T>(T[] a)
    {
        var ret = new T[a.Length];
        for (int i = 0; i < a.Length; i++) ret[i] = a[i];
        return ret;
    }
    static T[][] copy2<T>(T[][] a)
    {
        var ret = new T[a.Length][];
        for (int i = 0; i < a.Length; i++)
        {
            ret[i] = new T[a[0].Length];
            for (int j = 0; j < a[0].Length; j++) ret[i][j] = a[i][j];
        }
        return ret;
    }
}
class Scan
{
    public int Int { get { return int.Parse(Console.ReadLine().Trim()); } }
    public long Long { get { return long.Parse(Console.ReadLine().Trim()); } }
    public string Str { get { return Console.ReadLine().Trim(); } }
    public int[] IntArr { get { return Console.ReadLine().Trim().Split().Select(int.Parse).ToArray(); } }
    public int[] IntArrWithSep(char sep) { return Console.ReadLine().Trim().Split(sep).Select(int.Parse).ToArray(); }
    public long[] LongArr { get { return Console.ReadLine().Trim().Split().Select(long.Parse).ToArray(); } }
    public double[] DoubleArr { get { return Console.ReadLine().Split().Select(double.Parse).ToArray(); } }
    public string[] StrArr { get { return Console.ReadLine().Trim().Split(); } }
    public void Multi(out int a, out int b) { var arr = IntArr; a = arr[0]; b = arr[1]; }
    public void Multi(out int a, out int b, out int c) { var arr = IntArr; a = arr[0]; b = arr[1]; c = arr[2]; }
    public void Multi(out int a, out int b, out int c, out int d) { var arr = IntArr; a = arr[0]; b = arr[1]; c = arr[2]; d = arr[3]; }
    public void Multi(out int a, out string b) { var arr = StrArr; a = int.Parse(arr[0]); b = arr[1]; }
    public void Multi(out string a, out int b) { var arr = StrArr; a = arr[0]; b = int.Parse(arr[1]); }
    public void Multi(out int a, out int b, out string c) { var arr = StrArr; a = int.Parse(arr[0]); b = int.Parse(arr[1]); c = arr[2]; }
    public void Multi(out int a, out char b) { var arr = StrArr; a = int.Parse(arr[0]); b = arr[1][0]; }
    public void Multi(out char a, out int b) { var arr = StrArr; a = arr[0][0]; b = int.Parse(arr[1]); }
    public void Multi(out long a, out long b) { var arr = LongArr; a = arr[0]; b = arr[1]; }
    public void Multi(out long a, out int b) { var arr = LongArr; a = arr[0]; b = (int)arr[1]; }
    public void Multi(out int a, out long b) { var arr = LongArr; a = (int)arr[0]; b = arr[1]; }
    public void Multi(out string a, out string b) { var arr = StrArr; a = arr[0]; b = arr[1]; }
}
class mymath
{
    public bool isprime(long a)
    {
        if (a < 2) return false;
        for (long i = 2; i * i <= a; i++) if (a % i == 0) return false;
        return true;
    }
    public long[][] powmat(long[][] A, long n, int M)
    {
        var E = new long[A.Length][];
        for (int i = 0; i < A.Length; i++)
        {
            E[i] = new long[A.Length];
            E[i][i] = 1;
        }
        if (n == 0) return E;
        var t = powmat(A, n / 2, M);
        if ((n & 1) == 0) return mulmat(t, t, M);
        return mulmat(mulmat(t, t, M), A, M);
    }
    public long[] mulmat(long[][] A, long[] x, int M)
    {
        var ans = new long[A.Length];
        for (int i = 0; i < A.Length; i++) for (int j = 0; j < x.Length; j++) ans[i] = (ans[i] + x[j] * A[i][j]) % M;
        return ans;
    }
    public long[][] mulmat(long[][] A, long[][] B, int M)
    {
        var ans = new long[A.Length][];
        for (int i = 0; i < A.Length; i++)
        {
            ans[i] = new long[B[0].Length];
            for (int j = 0; j < B[0].Length; j++) for (int k = 0; k < B.Length; k++) ans[i][j] = (ans[i][j] + A[i][k] * B[k][j]) % M;
        }
        return ans;
    }
    public long powmod(long a, long b, long M)
    {
        if (a == 0) return 0;
        if (b == 0) return 1;
        var t = powmod(a, b / 2, M);
        if ((b & 1) == 0) return t * t % M;
        return t * t % M * a % M;
    }
    public long gcd(long a, long b)
    {
        while (b > 0) { var t = a % b; a = b; b = t; }
        return a;
    }
    public long lcm(long a, long b) { return a * (b / gcd(a, b)); }
    public long Comb(int n, int r)
    {
        const int M = 1000000007;
        if (n < 0 || r < 0 || r > n) return 0;
        if (n - r < r) r = n - r;
        if (r == 0) return 1;
        if (r == 1) return n;
        var numerator = new int[r];
        var denominator = new int[r];
        for (int k = 0; k < r; k++)
        {
            numerator[k] = n - r + k + 1;
            denominator[k] = k + 1;
        }
        for (int p = 2; p <= r; p++)
        {
            int pivot = denominator[p - 1];
            if (pivot > 1)
            {
                int offset = (n - r) % p;
                for (int k = p - 1; k < r; k += p)
                {
                    numerator[k - offset] /= pivot;
                    denominator[k] /= pivot;
                }
            }
        }
        long result = 1;
        for (int k = 0; k < r; k++) if (numerator[k] > 1) result = result * numerator[k] % M;
        return result;
    }
}