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#include<fstream>
using namespace std;
int v[1025],w[1025],a[1025][1025],res[1025];
int main()
{
int n,m,i,j;
ifstream fcin("cmlsc.in");
ofstream fcout("cmlsc.out");
fcin>>n>>m;
for(i=0;i<n;i++)
fcin>>v[i];
for(i=0;i<m;i++)
fcin>>w[i];
for(i=0;i<m;i++)
if(w[i]==v[0])
a[0][i]=1;
else a[0][i]=0;
for(i=1;i<n;i++)
if(v[i]==w[0])
a[i][0]=1;
else a[i][0]=0;
for(i=1;i<n;i++)
for(j=1;j<m;j++)
{
if(v[i]==w[j])
{
a[i][j]=a[i-1][j-1]+1;
}
else
{
a[i][j]=max(a[i-1][j],a[i][j-1]);
}
}
fcout<<a[n-1][m-1]<<"\n";
i=n-1;
j=m-1;
int k=0;
while(i>=0 && j>=0)
{
if(v[i]==w[j])
{
res[k++]=v[i];
i--; j--;
}
else
{
if(a[i-1][j]>a[i][j-1])
i--;
else
j--;
}
}
for(i=k-1;i>=0;i--)
fcout<<res[i]<<" ";
fcin.close();
fcout.close();
return 0;
}