#include 
#include 
#include 
using namespace std;

int main() {
    int n, m;
    cin >> n >> m;
    
    char mat[n][m];
    int si, sj, ei, ej;
    for(int i = 0; i < n; i++) {
        for(int j = 0; j < m; j++) {
            cin >> mat[i][j];
            
            if(mat[i][j] == 'P') {
                si = i;
                sj = j;
            }
            if(mat[i][j] == 'K') {
                ei = i;
                ej = j;
            }
        }
    }
    
    int di[] = {-1, 1, 0, 0};
    int dj[] = {0, 0, -1, 1};
    
    int di2[] = {-2, 2, 0, 0};
    int dj2[] = {0, 0, -2, 2};
    
    int di3[] = {-3, 3, 0, 0};
    int dj3[] = {0, 0, -3, 3};
    vector> visited(n, vector(m, false));
    vector> visited2(n, vector(m, false));
    vector> visited3(n, vector(m, false));

    queue q;
    q.push(si);
    q.push(sj);
    q.push(0);
    q.push(1);
    
    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();
        
        if(ci == ei and cj == ej) {
            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[ti][tj]) {
                    visited[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 + di2[i];
                    tj = cj + dj2[i];
                    
                    if(ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#' and !visited2[ti][tj]) {
                        q.push(ti);
                        q.push(tj);
                        q.push(dist + 1);
                        q.push(3);
                        visited2[ti][tj] = true;
                        
                    }
                    
                }
            }
        }
        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 + di2[i];
                    tj = cj + dj2[i];
                    
                    if(ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#') {
                        ti = ci + di3[i];
                        tj = cj + dj3[i];
                        
                        if(ti >= 0 and ti < n and tj >= 0 and tj < m and mat[ti][tj] != '#' and !visited3[ti][tj]) {
                            q.push(ti);
                            q.push(tj);
                            q.push(dist + 1);
                            q.push(1);
                            visited3[ti][tj] = true;
                        }
                        
                    }
                }
            }
        }
    }
    
    
    
    return 0;
}