#include <iostream>
#include <cstdio>
#include <queue>
using namespace std;
FILE *in =fopen("rj.in","r");
FILE *out=fopen("rj.out","w");
struct punct{int l,c;}romeo,julieta;
int dx[]={0,0,-1,1,-1,1,-1,1};
int dy[]={-1,1,0,0,-1,-1,1,1};
int const N=105;
int const MUT=8;
char matc[N][N];
int matr[N][N],matj[N][N];
bool gasitr,gasitj,viz[N][N];
int n,m;
void findc(int i, char c)
{
    for(int j=0;j<m;j++)
        if(matc[i][j]==c)
            if(c=='R')
            {
                gasitr=true;
                romeo.l=i;
                romeo.c=j;
                return;
            }
            else
            {
                gasitj=true;
                julieta.l=i;
                julieta.c=j;
                return;
            }
}
bool pot(punct x)
{
    if(viz[x.l][x.c])
        return false;
    if((x.l<0)||(x.c<0))
        return false;
    if(matc[x.l][x.c]=='X')
        return false;
    return true;
}
void init()
{
    for(int i=0;i<n;i++)
        for(int j=0;j<m;j++)
            viz[i][j]=0;
}
void bfs(punct start, char pers)
{
    init();
    int **matp;
    if(pers=='R')
        matp=matr;
    else
        matp=matj;
    queue<punct> coada;
    coada.push(start);
    viz[start.l][start.c]=true;
    punct curent;
    punct next;
    while(!coada.empty())
    {
        curent=coada.front();
        coada.pop();
        for(int i=0;i<MUT;i++)
        {
            next.l=curent.l+dy[i];
            next.c=curemt.c+dx[i];
            if(!pot(next))
                continue;
            coada.push(next);
            viz[next.l][next.c]=true;
            matp[next.l][next.c]=matp[curent.l][curent.c]+1;
        }
    }
}
int main()
{
    fscanf(in,"%d %d\n",&n,&m);
    for(int i=0;i<n;i++)
    {
        fgets(matc[i],N,in);
        if(!gasitr) findc(i,'R');
        if(!gasitj) findc(i,'J');
    }
    bfs(romeo,'R');
    return 0;
}