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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,vn[1025],vm[1025],l,mat[1025][1025],rez[1025];
/*int exec (int a,int b)
{
if (a==0 || b==0)
return 0;
else if (vn[a]==vm[b])
{
return exec(a-1,b-1)+1;
}
else
{
return max(exec(a-1,b),exec(a,b-1));
}
}*/
int main()
{
f>>n>>m;
for (int i=1; i<=n; i++)
{
f>>vn[i];
}
for (int i=1; i<=m; i++)
f>>vm[i];
for (int i=1; i<=n; i++)
{
for (int j=1; j<=m; j++)
{
if (vn[i]==vm[j])
mat[i][j]=mat[i-1][j-1]+1;
else mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
}
int i=n,j=m;
while (i>=1 && j>=1)
{
if (vn[i]==vm[j])
{
l++;
rez[l]=vn[i];
i--;
j--;
}
else
{
if (mat[i-1][j]>mat[i][j-1])
i--;
else j--;
}
}
g<<l<<'\n';
for (int i=l; i>=1; i--)
g<<rez[i]<<' ';
/*cout<<exec(n,m)<<'\n';
for (int j=l; j>0; j--)
cout<<rez[j]<<' ';*/
return 0;
}