#pragma region template
/*
    template made by nouka28
    last update 2024.6.30
*/

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

//atcoder
#include<atcoder/all>
using namespace atcoder;
using mint=atcoder::modint998244353;
// using mint=atcoder::modint1000000007;
// using mint=atcoder::modint;
istream& operator>>(istream&is,mint &x){long long x_;is>>x_;x=x_;return is;}
ostream& operator<<(ostream&os,mint &x){os<<x.val();return os;}

//pragma
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")

//define
// #define int i64
#define pb push_back
#define eb emplace_back
#define ep emplace
#define fi first
#define se second

#define ALL(x) begin(x),end(x)
#define LEN(x) (signed int)(x.size())

//using
using u32=unsigned int;
using u64=unsigned long long;
using i32=signed int;
using i64=signed long long;
using f64=double;
using f80=long double;
using pi=pair<i32,i32>;
using pl=pair<i64,i64>;
using pd=pair<f80,f80>;
template<class T>using V=vector<T>;
template<class T>using VV=V<V<T>>;
template<class T>using VVV=V<V<V<T>>>;
template<class T>using VVVV=V<V<V<V<T>>>>;
template<class T>using VVVVV=V<V<V<V<V<T>>>>>;
template<class T>using pqmax=priority_queue<T>;
template<class T>using pqmin=priority_queue<T,vector<T>,greater<T>>;


using u128=__uint128_t;
using i128=__int128_t;
//io INT128
i128 i128_parse(string &s){i128 ret=0;for(i32 i=0;i<(i32)s.length();i++)if('0'<=s[i]&&s[i]<='9')ret=10*ret+s[i]-'0';return ret;}
u128 u128_parse(string &s){u128 ret=0;for(i32 i=0;i<(i32)s.length();i++)if('0'<=s[i]&&s[i]<='9')ret=10*ret+s[i]-'0';return ret;}
istream &operator>>(istream &is,i128 &x){string s;is>>s;x=i128_parse(s);return is;}
istream &operator>>(istream &is,u128 &x){string s;is>>s;x=u128_parse(s);return is;}
ostream &operator<<(ostream &os,i128 x){
    ostream::sentry s(os);
    if(s){u128 tmp=x<0?-x:x;char buffer[128];char *d=end(buffer);
        do{--d;*d="0123456789"[tmp%10];tmp/=10;}while(tmp!=0);
        if(x<0){--d;*d='-';}
        int len=end(buffer)-d;
        if (os.rdbuf()->sputn(d,len)!=len){os.setstate(ios_base::badbit);}
    }
    return os;
}

//const
const i64 LINF=0x1fffffffffffffff;
const i32 INF=0x3fffffff;
const i64 MOD=998244353;
const i64 MOD2=1000000007;
const f80 PI=3.1415926535897932384626433832795028841971;
const f80 DINF=numeric_limits<f80>::infinity();
const f80 EPS=1e-9;
const i64 di[]={0,1,0,-1,1,-1,1,-1};
const i64 dj[]={1,0,-1,0,1,1,-1,-1};

//function
#define overload4(_1,_2,_3,_4,name,...) name
#define overload3(_1,_2,_3,name,...) name

#define REP1(n) for(i64 i=0;i<n;i++)
#define REP2(i,n) for(i64 i=0;i<n;i++)
#define REP3(i,a,b) for(i64 i=a;i<b;i++)
#define REP4(i,a,b,c) for(i64 i=a;i<b;i+=c)
#define REP(...) overload4(__VA_ARGS__,REP4,REP3,REP2,REP1)(__VA_ARGS__)

#define RREP1(n) for(i64 i=n;i--;)
#define RREP2(i,n) for(i64 i=n;i--;)
#define RREP3(i,a,b) for(i64 i=b;i-->(a);)
#define RREP4(i,a,b,c) for(i64 i=(a)+((b)-(a)-1)/(c)*(c)i>=a;i-=c)
#define RREP(...) overload4(__VA_ARGS__,RREP4,RREP3,RREP2,RREP1)(__VA_ARGS__)

#define SUM(...) accumulate(ALL(__VA_ARGS__),i64(0))
#define DSUM(...) accumulate(ALL(__VA_ARGS__),f80(0))

template<class T>bool chmin(T &x,const T&y){if(x>y){x=y;return true;}return false;}
template<class T>bool chmax(T &x,const T&y){if(x<y){x=y;return true;}return false;}
template<class T>bool lob(const V<T>&arr,const T&v){return (i32)(lower_bound(ALL(arr),v)-arr.begin());}
template<class T>bool upb(const V<T>&arr,const T&v){return (i32)(upper_bound(ALL(arr),v)-arr.begin());}


template<class T>constexpr auto min(T a,T b,T c){return min(a,min(b,c));}
template<class... T>constexpr auto min(T... a){return min(initializer_list<common_type_t<T...>>{a...});}
template<class T>constexpr auto max(T a,T b,T c){return max(a,max(b,c));}
template<class... T>constexpr auto max(T... a){return max(initializer_list<common_type_t<T...>>{a...});}

//io
struct SetUpIO{
    SetUpIO(){
        ios::sync_with_stdio(false);
        cin.tie(nullptr);
        cout<<fixed<<setprecision(15);
    }
}set_up_io;

//in
void scan(char &x){cin>>x;}
void scan(u32&x){cin>>x;}
void scan(u64 &x){cin>>x;}
void scan(i32 &x){cin>>x;}
void scan(i64 &x){cin>>x;}
void scan(string &x){cin>>x;}
void scan(mint &x){cin>>x;}

template<class T1,class T2>void scan(pair<T1,T2> &x){scan(x.first);scan(x.second);}
template<class T>void scan(V<T> &x){for(T &ele:x){scan(ele);}}
template<class T>void scan(deque<T> &x){for(T &ele:x){scan(ele);}}
template<class T,i32 size>void scan(array<T,size> &x){for(T &ele:x){scan(ele);}}
template<class T,i32 size>void scan(T (&x)[size]){for(T &ele:x){scan(ele);}}

void rd(){}
template<class Head,class... Tail>void rd(Head &head,Tail &...tail){scan(head);rd(tail...);}
#define CHR(...) char __VA_ARGS__;rd(__VA_ARGS__)
#define U32(...) u32 __VA_ARGS__;rd(__VA_ARGS__)
#define U64(...) u64 __VA_ARGS__;rd(__VA_ARGS__)
#define I32(...) i32 __VA_ARGS__;rd(__VA_ARGS__)
#define I64(...) i64 __VA_ARGS__;rd(__VA_ARGS__)
#define STR(...) string __VA_ARGS__;rd(__VA_ARGS__)
#define VEC(type,name,size) V<type> name(size);rd(name);
#define VVEC(type,name,size1,size2) VV<type> name(size1,V<type>(size2));rd(name)

//out
void print(){putchar(' ');}
void print(bool x){printf("%d",x);}
void print(u32 x){printf("%u",x);}
void print(u64 x){printf("%llu",x);}
void print(i32 x){printf("%d",x);}
void print(i64 x){printf("%lld",x);}
void print(char x){printf("%c",x);}
void print(f64 x){printf("%.15f",x);}
void print(f80 x){printf("%.15Lf",x);}
void print(const string &x){for(auto&&i:x)print(i);}
void print(mint x){printf("%d",x.val());}
template<class T>void print(const V<T>&);
template<class T1,class T2>void print(const pair<T1,T2>&x){print(x.first);putchar(' ');print(x.second);}
template<class T>void print(complex<T>&x){if(x.real()>=0)print('+');print(x.real());if(x.imag()>=0)print('+');print(x.imag());print('i');}
template<class T>void print(const V<T>&x){if(x.empty())return;print(x[0]);for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T>void print(const deque<T>&x){if(x.empty())return;print(x[0]);for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T>void print(const set<T>&x){if(x.empty())return;print(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T>void print(const unordered_set<T>&x){if(x.empty())return;print(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T>void print(const multiset<T>&x){if(x.empty())return;print(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T>void print(const unordered_multiset<T>&x){if(x.empty())return;print(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T1,class T2>void print(map<T1,T2>&x){if(x.empty())return;print(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T1,class T2>void print(unordered_map<T1,T2>&x){if(x.empty())return;print(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T,i32 size>void print(const array<T,size>&x){print(x[0]);for(auto i=x.begin();++i!=x.end();){putchar(' ');print(*i);}}
template<class T,i32 size>void print(const T(&x)[size]){print(x[0]);for(auto i=x;++i!=end(x);){/*putchar(' ');*/print(*i);}}

template<class T>void print(const T&a){cout<<a;}
int out(){putchar('\n');return 0;}
template<class T>int out(const T&t){print(t);putchar('\n');return 0;}
template<class Head,class... Tail>int out(const Head&head,const Tail&...tail){print(head);putchar(' ');out(tail...);return 0;}

#ifdef LOCAL
void dbg(){putchar(' ');}
void dbg(bool x){printf("%d",x);}
void dbg(u32 x){printf("%u",x);}
void dbg(u64 x){printf("%llu",x);}
void dbg(i32 x){printf("%d",x);}
void dbg(i64 x){printf("%lld",x);}
void dbg(char x){printf("%c",x);}
void dbg(f64 x){printf("%.15f",x);}
void dbg(f80 x){printf("%.15Lf",x);}
void dbg(const string &x){for(auto&&i:x)dbg(i);}
void dbg(mint x){printf("%d",x.val());}
template<class T>void dbg(const V<T>&);
template<class T1,class T2>void dbg(const pair<T1,T2>&x){putchar('(');dbg(x.first);putchar(',');dbg(x.second);putchar(')');}
template<class T>void dbg(complex<T>&x){if(x.real()>=0)dbg('+');dbg(x.real());if(x.imag()>=0)dbg('+');dbg(x.imag());dbg('i');}
template<class T>void dbg(const V<T>&x){putchar('[');if(!x.empty()){dbg(x[0]);for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar(']');}
template<class T>void dbg(const deque<T>&x){putchar('[');if(!x.empty()){dbg(x[0]);for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar(']');}
template<class T>void dbg(const set<T>&x){putchar('{');if(!x.empty()){dbg(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar('}');}
template<class T>void dbg(const unordered_set<T>&x){putchar('{');if(!x.empty()){dbg(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar('}');}
template<class T>void dbg(const multiset<T>&x){putchar('{');if(!x.empty()){dbg(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar('}');}
template<class T>void dbg(const unordered_multiset<T>&x){putchar('{');if(!x.empty()){dbg(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar('}');}
template<class T1,class T2>void dbg(map<T1,T2>&x){putchar('{');if(!x.empty()){dbg(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar('}');}
template<class T1,class T2>void dbg(unordered_map<T1,T2>&x){putchar('{');if(!x.empty()){dbg(*x.begin());for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}}putchar('}');}
template<class T,i32 size>void dbg(const array<T,size>&x){putchar('[');dbg(x[0]);for(auto i=x.begin();++i!=x.end();){putchar(',');dbg(*i);}putchar(']');}
template<class T,i32 size>void dbg(const T(&x)[size]){/*putchar('[');*/dbg(x[0]);for(auto i=x;++i!=end(x);){/*putchar(' ')*/;dbg(*i);}/*putchar(']');*/}

template<class T>void dbg(const T&a){cout<<a;}
int dbg2(){putchar('\n');return 0;}
template<class T>int dbg2(const T&t){dbg(t);putchar('\n');return 0;}
template<class Head,class... Tail>int dbg2(const Head&head,const Tail&...tail){dbg(head);putchar(' ');dbg2(tail...);return 0;}

#define debug(...) {dbg((string)(#__VA_ARGS__));dbg(":");dbg2(__VA_ARGS__);}
#else
#define debug(...) void(0)
#endif

//random
random_device rnd;mt19937 mt(rnd());const i64 MT_MAX=LINF;
uniform_int_distribution<i64> RAND(0,MT_MAX);
f64 randd(){return 1.0*RAND(mt)/MT_MAX;}
//random value [a,b]
i64 randint(i64 a,i64 b){return a+RAND(mt)%(b-a+1);}

//funtion2
#define extrep(v,...) for(auto v:__MAKE_MAT__({__VA_ARGS__}))
vector<vector<i64>> __MAKE_MAT__(vector<i64> v){
    if(v.empty())return vector<vector<i64>>(1,vector<i64>());
    i64 n=v.back();v.pop_back();vector<vector<i64>> ret,tmp=__MAKE_MAT__(v);
    for(auto e:tmp)for(i64 i=0;i<n;++i){ret.push_back(e);ret.back().push_back(i);}
    return ret;
}

//V',Pを返す。PはVを昇順に並べた時のidx
template<class T>
pair<vector<T>,vector<i32>> sortperm(vector<T> v){
    vector<pair<T,int>> sv;
    for(i32 i=0;i<(i32)v.size();i++){sv.push_back({v[i],i});}
    sort(sv.begin(),sv.end());vector<T> rv;vector<i32> p;
    for(auto[x,idx]:sv){rv.push_back(x);p.push_back(idx);}
    return {rv,p};
}
i64 pow(i64 a,i64 b){i64 x=1;while(b){if(b&1){x*=a;}a=a*a;b>>=1;}return x;}
bool isupper(char x){return('A'<=x&&x<='Z');}
bool islower(char x){return('a'<=x&&x<='z');}
char upper(char &x){if(isupper(x)){return x;}return x-'a'+'A';}
char lower(char &x){if(islower(x)){return x;}return x-'A'+'a';}
string upper(string s){for(auto&e:s)e=upper(e);return s;}
string lower(string s){for(auto&e:s)e=lower(e);return s;}
bool isdigit(char x){return('0'<=x&&x<='9');}
bool ingrid(int x,int y,int h,int w){return 0<=x&&x<h&&0<=y&&y<w;}

#pragma endregion

int main(){
    I32(h,w);
    VVEC(char,G,h,w);
    VV<bool> t(h,V<bool>(w)),t2(h,V<bool>(w));
    auto dfs=[&](auto dfs,int i,int j,VV<bool> &t,bool f)->int {
        t[i][j]=1;
        int sz=1;
        for(int k=0;k<4;k++){
            int ni=i+di[k],nj=j+dj[k];
            if(ingrid(ni,nj,h,w)&&G[i][j]==G[ni][nj]&&!t[ni][nj])sz+=dfs(dfs,ni,nj,t,f);
        }
        if(f)G[i][j]='.';
        return sz;
    };
    REP(i,h)REP(j,w){
        if(!t[i][j]){
            if(dfs(dfs,i,j,t,0)>=4)dfs(dfs,i,j,t2,1);
        }
    }
    for(auto&&vec:G){for(auto&&c:vec)print(c);out();}
}