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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin ("cmlsc.in");
ofstream fout ("cmlsc.out");
int n, m, o[100][100], a[100], b[100], sir[100], bst;
void citire()
{
fin >> n;
fin >> m;
if(m>n)
{
int p=n;
n=m;
m=p;
}
for(int i=1;i<=n;i++)
fin >> a[i];
for(int i=1;i<=m;i++)
fin >> b[i];
}
int main()
{
citire();
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
o[i][j]=1+o[i-1][j-1];
else
o[i][j]=max(o[i-1][j], o[i][j-1]);
}
}
fout << o[n][m] << '\n';
for (int i = n, j = m; i; ){
if (a[i] == b[j])
sir[++bst] = a[i], --i, --j;
else if (o[i-1][j] < o[i][j-1])
--j;
else
--i;
}
for(int i=o[n][m];i>=1;i--)
fout << sir[i] << " ";
return 0;
}