#define _CRT_SECURE_NO_WARNINGS
#include<map>
#include<queue>
#include<vector>
#include<fstream>
#include<cstring>
#include<iostream>
#include<algorithm>
#include<unordered_map>
using namespace std;

const int N=1100;
const int dx[]={0,0,1,-1}; //right left down up
const int dy[]={1,-1,0,0};
int n,m;
char s[N][N];
struct Node{
	int dir,x,y;
	char c;
	Node(int _x,int _y):x(_x),y(_y){}
	Node(int _dir,int _x,int _y,char _c):x(_x),y(_y),dir(_dir),c(_c){}
};
queue<Node>a[N][N];
queue<Node>q;

inline bool push(int dir,char c,int x,int y)
{
	while(1)
	{
		if(s[x][y]!='x')
		{
			if(s[x][y]=='.')
				s[x][y]=c;
			else if(s[x][y]!=c)
				s[x][y]='x',q.push(Node(x,y));
			a[x][y].push(Node(dir,x,y,c));
			return 1;
		}
		x+=dx[dir],y+=dy[dir];
		if(x>n||x<1||y>m||y<1)return 0;
	}
	return 0;
}

inline bool push(Node pos){return push(pos.dir,pos.c,pos.x,pos.y);}


signed main()
{
	scanf("%d%d",&n,&m);
	for(int i=0;i<=n+1;i++)
		scanf("%s",s[i]);
	bool valid=1;
	for(int i=1;i<=n;i++)
	{
		if(s[i][0]!='.')valid&=push(0,s[i][0],i,1);
		if(s[i][m+1]!='.')valid&=push(1,s[i][m+1],i,m);
	}
	for(int j=1;j<=m;j++)
	{
		if(s[0][j]!='.')valid&=push(2,s[0][j],1,j);
		if(s[n+1][j]!='.')valid&=push(3,s[n+1][j],n,j);
	}
	if(!valid)
	{
		puts("NO");
		return 0;
	}
	while(q.size())
	{
		Node pos=q.front();q.pop();
		while(a[pos.x][pos.y].size())
		{
			Node box=a[pos.x][pos.y].front();
			a[pos.x][pos.y].pop();
			if(!push(box))
			{
				puts("NO");
				return 0;
			}
		}
	}
	puts("YES");
	for(int i=1;i<=n;i++)
	{
		for(int j=1;j<=m;j++)
			putchar(s[i][j]=='x'?'.':s[i][j]);
		putchar('\n');
	}
	return 0;
}