#include<iostream>
#include<fstream>
#include<vector>
#include<queue>
#include<string>
#include<math.h>
using namespace std;
#define BIT_TOOGLE(num, index) (num) |= (1<<(index))
#define BIT_CLEAR(num, index) (num) &= ~(1<<(index))
#define BIT_SET_VALUE(num, index, bit) \
if(bit)\
BIT_TOOGLE(num,index);\
else\
BIT_CLEAR(num,index);
bool bit_check(uint8_t num, uint8_t index){
uint8_t mask=pow(2,index);
mask&=num;
if(mask==pow(2,index))
return true;
else
return false;
}
int main(){
vector<unsigned short> line, line_cur;
vector<vector<uint8_t > >par;
string x,y;
getline(cin, x);
getline(cin, y);
uint8_t siz;
if((y.size())%4==0)
siz=(y.size())/4;
else
siz=(y.size())/4+1;
vector<uint8_t> temp2(siz,0);
vector<char> ans;
for(unsigned short i=0;i<=x.size();++i)
par.push_back(temp2);
unsigned short m=x.size();
unsigned short n=y.size();
unsigned short cur;
for(unsigned short i=0;i<n+1;++i)
line.push_back(0);
unsigned short prev=0;
for(unsigned short i=1;i<m+1;++i){
line_cur.push_back(0);
for(unsigned short j=1;j<n+1;++j){
if(x[i-1]==y[j-1]){
cur=line[j-1]+1;
BIT_SET_VALUE(par[i][j],2*j%4,1);
}
else{
if(line[j]>=prev){
cur=line[j];
par[i][j]=2;
BIT_SET_VALUE(par[i][j],2*j%4+1,1);
}
else{
cur=prev;
BIT_SET_VALUE(par[i][j],2*j%4,1);
BIT_SET_VALUE(par[i][j],2*j%4+1,1);
}
}
prev=cur;
line_cur.push_back(cur);
}
line=line_cur;
prev=0;
line_cur.clear();
}
while(true){
if(m==0||n==0)
break;
if(bit_check(par[m][n],2*n%4)&&!bit_check(par[m][n],2*n%4+1)){
--m;
--n;
ans.push_back(x[m]);
}
else{
if(!bit_check(par[m][n],2*n%4)&&bit_check(par[m][n],2*n%4+1))
--m;
else
--n;
}
}
for(int i=ans.size()-1;i>=0;i--){
cout<<ans[i];
}
cout<<endl;
}
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