#include <iostream>
#include <queue>
#include <algorithm>
using namespace std;

int main()
{
    int n, m, pi, pj, ki, kj;
    cin >> n >> m;
    char mat[n][m];
    for(int i = 0; i< n; i++){
        for(int j = 0; j < m; j++){
            cin >> mat[i][j];
            if (mat[i][j] == 'P'){
                pi = i;
                pj = j;
            }
             if (mat[i][j] == 'K'){
                ki = i;
                kj = j;
            }
        }
    }
    bool visited[3][n][m];
    for(int i = 0; i < 3; i++){
        for(int j = 0; j < n; j++){
            for(int z = 0; z < m; z++){
                visited[i][j][z] = false;
            }
        }
    }
    visited[0][pi][pj] = true;

    int di[] = {1, -1, 0, 0, 2, -2, 0, 0, 3, -3, 0, 0};
    int dj[] = {0, 0, 1, -1, 0, 0, 2, -2, 0, 0, 3, -3};

    queue<int> q;
    q.push(pi);
    q.push(pj);
    q.push(0);
    q.push(1);
//    cout << pi << " " << pj << endl;

    while (!q.empty()){
        int ci = q.front();
        q.pop();
        int cj = q.front();
        q.pop();
        int dist = q.front();
        q.pop();
        int cekor = q.front();
        q.pop();
//        cout << ci << " " << cj << endl;
//        cout << mat[ci][cj] << " " << endl;
        if(mat[ci][cj] == 'K'){
            cout << dist << endl;
            return 0;
        }

        if (cekor == 1){
            for (int i = 0; i < 4; i++){
                int ti = ci + di[i];
                int tj = cj + dj[i];
                if (ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#' and !visited[0][ti][tj]){
                    visited[0][ti][tj] = true;
                    q.push(ti);
                    q.push(tj);
                    q.push(dist + 1);
                    q.push(2);
                }
            }
        }
        else if (cekor == 2){
            for (int i = 0; i < 4; i++){
                int ti = ci + di[i];
                int tj = cj + dj[i];
                if (ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#'){
                    ti = ci + di[i + 4];
                    tj = cj + dj[i + 4];
                    if (ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#' and !visited[1][ti][tj]){
                        visited[1][ti][tj] = true;
                        q.push(ti);
                        q.push(tj);
                        q.push(dist+1);
                        q.push(3);
                    }
                }
            }
        }else if (cekor == 3){
            for (int i = 0; i < 4; i++){
                int ti = ci + di[i];
                int tj = cj + dj[i];
                if (ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#'){
                    ti = ci + di[i + 4];
                    tj = cj + dj[i + 4];
                    if (ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#'){
                        ti = ci + di[i + 8];
                        tj = cj + dj[i + 8];
                        if (ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#' and !visited[2][ti][tj]){
                            visited[2][ti][tj] = true;
                            q.push(ti);
                            q.push(tj);
                            q.push(dist+1);
                            q.push(1);
                        }
                    }
                }
            }
        }

    }

    return 0;
}