#include<bits/stdc++.h>
using namespace std;
int n, m, ans = 1e9, vis[30][30];
int dx[] = {0, 0, 1,-1}, dy[] = {1,-1, 0, 0};
int sx, sy, ex, ey;
char c[30][30];
//我们当前在(x,y)这个点，并且已经走了step步
void dfs(int x, int y, int step){
    if(step>ans) return ;
	if (x == ex && y == ey){
		ans = min(ans, step);
		return;
	}
	for (int i = 0; i < 4; i++){//遍历四个方向
		int nx = x + dx[i], ny = y + dy[i];
		if (nx >= 1 && nx<= n && ny>= 1 && ny <= m && vis[nx][ny] == 0 && c[nx][ny] !=  '#'){
			vis[nx][ny] = 1;
			dfs(nx, ny, step + 1 + (c[nx][ny] ==  'x'));
			vis[nx][ny] = 0;
		}
	}
}
int main(){
	cin >> n >> m;
	for (int i = 1; i <= n; i++){
		for (int j = 1; j <= m; j++){
			cin >> c[i][j];
			if (c[i][j] ==  'r') sx = i, sy = j;
			if (c[i][j] ==  'a') ex = i, ey = j;
		}
	}
	vis[sx][sy] = 1;
	dfs(sx, sy, 0);
	if (ans == 1e9) cout <<  "Impossible";
	else cout << ans;
	return 0;
}