Go: package main

import (
	"bufio"
	"fmt"
	"math"
	"os"
	"strconv"
)

func configure(scanner *bufio.Scanner) {
	scanner.Split(bufio.ScanWords)
	scanner.Buffer(make([]byte, 1000005), 1000005)
}
func getNextString(scanner *bufio.Scanner) string {
	scanned := scanner.Scan()
	if !scanned {
		panic("scan failed")
	}
	return scanner.Text()
}
func getNextInt(scanner *bufio.Scanner) int {
	i, _ := strconv.Atoi(getNextString(scanner))
	return i
}
func getNextInt64(scanner *bufio.Scanner) int64 {
	i, _ := strconv.ParseInt(getNextString(scanner), 10, 64)
	return i
}
func getNextFloat64(scanner *bufio.Scanner) float64 {
	i, _ := strconv.ParseFloat(getNextString(scanner), 64)
	return i
}
func main() {
	fp := os.Stdin
	wfp := os.Stdout
	extra := 0
	if os.Getenv("I") == "IronMan" {
		fp, _ = os.Open(os.Getenv("END_GAME"))
		extra = 100
	}
	scanner := bufio.NewScanner(fp)
	configure(scanner)
	writer := bufio.NewWriter(wfp)
	defer func() {
		r := recover()
		if r != nil {
			fmt.Fprintln(writer, r)
		}
		writer.Flush()
	}()
	solve(scanner, writer)
	for i := 0; i < extra; i++ {
		fmt.Fprintln(writer, "-----------------------------------")
		solve(scanner, writer)
	}
}
func solve(scanner *bufio.Scanner, writer *bufio.Writer) {
	dy := [4]int{-1, 0, 0, 1}
	dx := [4]int{0, -1, 1, 0}
	for {
		h := getNextInt(scanner)
		w := getNextInt(scanner)
		if h == 0 {
			break
		}
		grid := makeGrid(h, w)
		a := [2]int{}
		b := [2]int{}
		for i := 0; i < h; i++ {
			s := getNextString(scanner)
			for j := 0; j < w; j++ {
				if s[j] == '#' {
					grid[i][j] = math.MaxInt32
					continue
				}
				if s[j] == 'A' {
					a[0] = i
					a[1] = j
					continue
				}
				if s[j] == 'B' {
					b[0] = i
					b[1] = j
				}
				grid[i][j] = math.MaxInt32 - 1
			}
		}
		q := make([][2]int, 0)
		q = append(q, a)
		for len(q) > 0 {
			p := q[0]
			q = q[1:]
			for i := 0; i < 4; i++ {
				yy := p[0] + dy[i]
				xx := p[1] + dx[i]
				if yy == a[0] && xx == a[1] {
					continue
				}
				if yy < 0 || yy >= h {
					continue
				}
				if xx < 0 || xx >= w {
					continue
				}
				if grid[yy][xx] == math.MaxInt32 {
					continue
				}
				if grid[yy][xx] <= grid[p[0]][p[1]]+1 {
					continue
				}
				grid[yy][xx] = grid[p[0]][p[1]] + 1
				q = append(q, [2]int{yy, xx})
			}
		}
		move := getNextString(scanner)
		i := 0
		m := len(move)
		for {
			if i > 400 {
				fmt.Fprintln(writer, "impossible")
				break
			}
			if grid[b[0]][b[1]] <= i {
				fmt.Fprintln(writer, fmt.Sprintf("%d %d %d", i, b[0], b[1]))
				break
			}
			switch move[i%m] {
			case '8':
				if b[0] > 0 {
					b[0]--
				}
			case '6':
				if b[1]+1 < w {
					b[1]++
				}
			case '4':
				if b[1] > 0 {
					b[1]--
				}
			case '2':
				if b[0]+1 < h {
					b[0]++
				}
			}
			i++
		}
	}
}
func makeGrid(h, w int) [][]int {
	index := make([][]int, h, h)
	data := make([]int, h*w, h*w)
	for i := 0; i < h; i++ {
		index[i] = data[i*w : (i+1)*w]
	}
	return index
}

C++: #import<stdio.h>
#import<queue>
int main(){std::queue<int>q;int w,h,f[484],i,j,a,b,t,x,z;char p[15];for(;scanf("%d%d ",&h,&w),h;){for(j=0;j<w+2;j++)f[j]=f[j-~h*22]=-1;for(i=1;i<=h;i++){for(j=1;j<=w;j++)f[x=i*22+j]=-2,z=getchar(),z-35?z>65?b=x:z>64?a=x:1:--f[x];f[i*22]=f[i*22-~w]=-9;getchar();}f[a]=t=0;q.push(0);for(q.push(a);a=q.front(),q.size()>1;q.pop())if(!a)++t,q.push(0);else for(i=4;i--;)if(f[x=a+" 57L"[i]-54]==-2)f[x]=t,q.push(x);q.pop();scanf("%s",p);for(a=t=0;!a;){x=b;z=0;for(i=0;!a&&p[i];f[b]>=0&&++z)++t,~f[j=b-54+"L65676 "[p[i++]-50]]?b=j:0,f[b]>=0&t>=f[b]?a=b:0;!z&!a&!p[i]&b==x&f[b]<0&&--a;}printf(~a?"%d %d %d\n":"impossible\n",t,a/22-1,a%22-1);}}

C++: #include "bits/stdc++.h"

using namespace std;

typedef vector<int> vi;
typedef pair<int,int> pii;
typedef long long ll;

#define rep(i,n) for(ll i=0;i<(ll)(n);i++)
#define all(a)  (a).begin(),(a).end()
#define pb push_back

vector<string> data(20);
int dist[20][20]={};
bool visited[20][20];
int h,w;


void dfs(int y,int x){
	if( y<0 || y>=h || x<0 || x>=w || visited[y][x]==true || data[y][x]=='#' )return ;

	visited[y][x]=true;

	int a = (y+1<h )?dist[y+1][x]:999999999;
	int b = (y-1>=0)?dist[y-1][x]:999999999;
	int c = (x+1<w )?dist[y][x+1]:999999999;
	int d = (x-1>=0)?dist[y][x-1]:999999999;

	dist[y][x]=min( dist[y][x] , min(min(a,b) , min(c,d))+1 );

	dfs(y+1,x);
	dfs(y-1,x);
	dfs(y,x+1);
	dfs(y,x-1);
}
int main(){
	while(cin>>h>>w){
		if(h==0&&w==0)break;
		data.clear();
		rep(i,20)rep(j,20){dist[i][j]=999999999;visited[i][j]=false;}
		string move;

		rep(i,h) cin>>data[i];
		cin>>move;		

		int sx,sy,gx,gy;
		rep(i,h)rep(j,w){
			if(data[i][j]=='A'){ sy=i;sx=j; }
			if(data[i][j]=='B'){ gy=i;gx=j;data[i][j]='.'; }
		}

		dist[sy][sx]=0;
		dfs(sy,sx);

		for(int i=0;;i++){
			if(dist[gy][gx]<=i){
				cout<<i<<" "<<gy<<" "<<gx<<endl;
				break;
			}
			if(move[i%move.size()]=='5'){;					}
			if(move[i%move.size()]=='8'){gy=max(0,gy-1);	}
			if(move[i%move.size()]=='6'){gx=min(w-1,gx+1);	}
			if(move[i%move.size()]=='4'){gx=max(0,gx-1);	}
			if(move[i%move.size()]=='2'){gy=min(h-1,gy+1);	}
			if(i==3000000){
				cout<<"impossible"<<endl;
				break;
			}

		}

	}
	return 0;
}

C++: //35
#include<iostream>
#include<algorithm>
#include<string>

using namespace std;

char g[20][20];
int h,w;
int t[20][20];

void ff(int x,int y,int ct){
  if(x<0||w<=x||y<0||h<=y||t[y][x]<ct||g[y][x]=='#')return;
  t[y][x]=ct;
  for(int i=0;i<4;i++){
    int d[]={0,1,0,-1,0};
    ff(x+d[i],y+d[i+1],ct+1);
  }
}

int main(){
  while(cin>>h>>w,h|w){
    int ax,ay,bx,by;
    for(int y=0;y<h;y++){
      for(int x=0;x<w;x++){
	cin>>g[y][x];
	if(g[y][x]=='A'){
	  ax=x;
	  ay=y;
	}else if(g[y][x]=='B'){
	  bx=x;
	  by=y;
	}
      }
    }
    fill(t[0],t[20],1<<30);
    ff(ax,ay,0);
    string p;
    getline(cin.ignore(),p);
    int e;
    for(e=0;e<10000;e++){
      if(t[by][bx]<=e)break;
      char o=p[e%p.size()];
      int ny=by+(o=='2')-(o=='8');
      int nx=bx+(o=='6')-(o=='4');
      if(0<=ny&&ny<h&&0<=nx&&nx<w){
	by=ny;
	bx=nx;
      }
    }
    if(e<10000){
      cout<<e<<' '<<by<<' '<<bx<<endl;
    }else{
      cout<<"impossible"<<endl;
    }
  }
  return 0;
}