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#include <iostream>
#include <fstream>
#define lim 1025
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int m,n;
int a[lim],b[lim];
int lsmax[lim][lim];
void showpath(int i,int j)
{
if(lsmax[i][j]==0)
return;
if(a[i]==b[j])
{
showpath(i-1,j-1);
fout<<a[i]<<" ";
return;
}
if(lsmax[i-1][j]>lsmax[i][j-1])
{
showpath(i-1,j);
return;
}
else
{
showpath(i,j-1);
return;
}
}
int main()
{
fin>>m>>n;
for(int i=1;i<=m;i++)
fin>>a[i];
for(int i=1;i<=n;i++)
fin>>b[i];
for(int i=1;i<=m;i++)
{
for(int j=1;j<=n;j++)
{
if(a[i]==b[j])
lsmax[i][j]=lsmax[i-1][j-1]+1;
else
lsmax[i][j]=max(lsmax[i][j-1],lsmax[i-1][j]);
}
}
fout<<lsmax[m][n]<<"\n";
showpath(m,n);
return 0;
}