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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,i,j,a[1025],b[1025],d[1025][1025],poz,sir[1025];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(a[i]==b[j])d[i][j]=d[i-1][j-1]+1;
else d[i][j]=max(d[i-1][j],d[i][j-1]);
}
poz=0;
for(i=n;i>=1;i--)
{
for(j=m;j>=1;j--)
{
if(a[i]==b[j])
{
poz++;
sir[poz]=a[i];
i--;j--;
}
else if(d[i-1][j]>d[i][j-1])i--;
else j--;
}
}
g<<d[n][m]<<'\n';
for(i=poz;i>=1;i--)
{
g<<sir[i]<<" ";
}
return 0;
}