#include<bits/stdc++.h>
using namespace std;
typedef pair<int,int> PII;
#define x first
#define y second
int dx[]={1,-1,-2,1,2,2,-2,2};
int dy[]={-2,1,1,-2,1,1,-1,1};
const int N=60;
char g[N][N];
int dist[N][N];
int n,m;
int sx,sy,ex,ey;
int bfs()
{
   queue<PII> q;
   q.push({ex,ey});
   memset(dist,-0x3f,sizeof dist);
   dist[ex][ey]=0;
   while(q.size())
   {
      PII t=q.front();
      q.pop();
      if(t.x==sx&&t.y==sy)
      {
         return dist[t.x][t.y];
      }
      for(int i=1;i<8;i++)
      {
         int a=ex+dx[i],b=ey+dy[i];
         if(a<=1||a>=n||b<=1||b>=m)
         {
            break;
         }
         if(g[a][b]=='H')
         {
            continue;
         }
         if(dist[a][b]!=-0x3f)
         {
            continue;
         }
         dist[sx][sy]=dist[t.x][t.y]+2;
         q.push({t.x,t.y});
      }
   }
}
int main()
{
   cin>>m>>n;
   for(int i=1;i<=n;i++)
   {
      for(int j=1;j<=m;j++)
      {
         cin>>g[i][j];
         if(g[i][j]=='k')
         {
            sx=i,sy=j;
         }
         if(g[i][j]=='h')
         {
            ex=i,ey=j;
         }
      }
   }
   cout<<bfs()<<endl;
   return 0;
}