//assert.h
/* 
 * assert.h
 * This file has no copyright assigned and is placed in the Public Domain.
 * This file is a part of the mingw-runtime package.
 * No warranty is given; refer to the file DISCLAIMER within the package.
 *
 * Define the assert macro for debug output.
 *
 */

#ifndef _ASSERT_H_
#define	_ASSERT_H_

/* All the headers include this file. */
#include <_mingw.h>

#ifndef RC_INVOKED

#ifdef	__cplusplus
extern "C" {
#endif

#ifdef NDEBUG

/*
 * If not debugging, assert does nothing.
 */
#define assert(x)	((void)0)

#else /* debugging enabled */

/*
 * CRTDLL nicely supplies a function which does the actual output and
 * call to abort.
 */
_CRTIMP void __cdecl _assert (const char*, const char*, int)
#ifdef	__GNUC__
	__attribute__ ((noreturn))
#endif
	;

/*
 * Definition of the assert macro.
 */
#define assert(e)       ((e) ? (void)0 : _assert(#e, __FILE__, __LINE__))
#endif	/* NDEBUG */

#ifdef	__cplusplus
}
#endif

#endif /* Not RC_INVOKED */

#endif /* Not _ASSERT_H_ */

//dfs.cpp



#include<iostream>
#define N 105
using namespace std;
int dx[8]={1,1,1,0,0,-1,-1,-1}; 
int dy[8]={1,0,-1,1,-1,1,0,-1};
char d[N][N];
int n,m,a,b;
void dfs(int x,int y){
	d[x][y]='@';
	for(int k=0;k<8;k++){
		int nx=x+dx[k],ny=y+dy[k];
		if(nx>=1&&nx<=n&&ny>=1&&ny<=m&&d[nx][ny]=='-')
			dfs(nx,ny);
	}
}
void print(){
	for(int i=1;i<=n;i++,cout<<endl)
		for(int j=1;j<=m;j++)cout<<d[i][j];
}
int main(){
	cin>>n>>m>>a>>b;
	for(int i=1;i<=n;i++)
		for(int j=1;j<=m;j++)
			cin>>d[i][j];
	dfs(a,b);
	print();
	return 0;
}