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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
short n,m,i,j,mat[1025][1025];
short v[1025],w[1025];
short af[1025];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>v[i];
for(i=1;i<=m;i++)
f>>w[i];
for(i=0;i<=n;i++)
{
mat[0][i]=0;
mat[i][0]=0;
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(v[i]==w[j])
{
mat[i][j]=1+mat[i-1][j-1];
}
else
{
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
}
}
int l=mat[n][m];
i=n;
j=m;
while(i>0 && j>0)
{
if(v[i]==w[j])
{
af[l]=v[i];
//g<<v[i]<<" ";
i--;
j--;
l--;
}
else if (mat[i-1][j] > mat[i][j-1])
{
i--;
}
else j--;
}
g<<mat[n][m]<<"\n";
/*for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
g<<mat[i][j]<<" ";
g<<"\n";
}*/
for(i=1;i<=mat[n][m];i++)
{
g<<af[i]<<" ";
}
return 0;
}