#include <bits/stdc++.h>
using namespace std;

struct xy
{
	int x;
	int y;
};

char d[300][300];
int b[300][300];

xy men[26][100000];
int ji[26];
int mc;

xy ed;
xy st;

int n,m;
queue<xy>q;

xy s1;
xy s2;
int now;
int fx[]={0,1,-1,0,0};
int fy[]={0,0,0,1,-1};

int main()
{
	
	cin>>n>>m;
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<m;j++)
		{
			cin>>d[i][j];
			if(d[i][j]=='@')
			{
				st.x=i;
				st.y=j;
			}
			if(d[i][j]=='=')
			{
				ed.x=i;
				ed.y=j;
			}
			if(d[i][j]>='A'&&d[i][j]<='Z')
			{
				mc=d[i][j]-'A';
				men[mc][ji[mc]].x=i;
				men[mc][ji[mc]].y=j;
				ji[mc]++;
			}
			
			b[i][j]=-1; 
		}
	}
	
	q.push(st);
	b[st.x][st.y]=0;
	
	while(!q.empty())
	{
		s1=q.front();
		now=b[s1.x][s1.y]+1;
		for(int i=1;i<=4;i++)
		{
			s2.x=s1.x+fx[i];
			s2.y=s1.y+fy[i];
			
			if(s2.x<0||s2.x>=n||s2.y<0||s2.y>m||d[s2.x][s2.y]=='#')continue;
			
			if(b[s2.x][s2.y]==-1)
			{
				if(d[s2.x][s2.y]=='.'||d[s2.x][s2.y]=='=')//不是字母 
				{
					b[s2.x][s2.y]=now;
					q.push(s2);
				}
				
				else//是字母
				{
					mc=d[s2.x][s2.y]-'A';
					for(int j=0;j<ji[mc];j++)
					{
						if(men[mc][j].x!=s2.x&&men[mc][j].y!=s2.y&&b[men[mc][j].x][men[mc][j].y]==-1)
						{
							b[men[mc][j].x][men[mc][j].y]=now;
							q.push(men[mc][j]);
						}
					}
				}
			}

		}
		q.pop();
	}
	
	for(int i=0;i<n;i++)
	{
		for(int j=0;j<m;j++)
		{
			printf("%-3d",b[i][j]);
		}
		cout<<endl;
	}
	
	cout<<b[ed.x][ed.y];
	
	return 0;
}