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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n,m,x,a[1024],b[1024],d[1024][1024],s[1024],c,l;
int main()
{
fin >> n >> m;
for(int i=1;i<=n;++i)
{
fin >> a[i];
}
for(int i=1;i<=m;++i)
{
fin >> b[i];
}
for(int i=1;i<=n;++i)
{
for(int 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]);
}
}
int i = n, j = m;
while(i)
{
if(a[i]==b[j])
{
s[c++]= a[i];
--i;
--j;
}
else if(d[i-1][j]<d[i][j-1])
--j;
else
--i;
}
fout << c << '\n';
for(int i=0;i<c;++i)
fout << s[i] << " ";
return 0;
}