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#include <iostream>
#include <fstream>
#define N 1150
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[N],b[N],m,n,d[N][N],sir[N],best;
int main()
{
int i,j;
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>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])
{
sir[++best]=a[i];
--i;
--j;
}
else
if(d[i-1][j]<d[i][j-1])
--j;
else
--i;
}
g<<best<<endl;
for(i=best;i>=1;i--)
g<<sir[i]<<' ';
return 0;
}