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#include <fstream>
#include <algorithm>
using namespace std;
ifstream fi("cmlsc.in");
ofstream fo("cmlsc.out");
int n,m,i,j,A[1024],B[1024],D[1024][1024],R[1024],rez;
int main()
{
fi>>n>>m;
for(i=1; i<=n; i++)
fi>>A[i];
for(i=1; i<=m; i++)
fi>>B[i];
for(i=1; i<=n; i++)
{
for(j=1; j<=m; j++)
{
if(A[i]==B[j])
{
D[i][j]=1+D[i-1][j-1];
}
else
D[i][j]=max(D[i-1][j],D[i][j-1]);
}
}
for(i=n, j=m; i;)
{
if(A[i]==B[j])
{
R[++rez]=A[i];
i--;
j--;
}
else
{
if(D[i-1][j]<D[i][j-1])
{
j--;
}
else
{
i--;
}
}
}
fo<<rez<<"\n";
for(i=rez; i>=1; i--)
{
fo<<R[i]<<" ";
}
fo<<"\n";
fi.close();
fo.close();
return 0;
}