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#include <iostream>
#include <fstream>
using namespace std;
ifstream f ("cmlsc.in");
ofstream g ("cmlsc.out");
int a[1025],b[1025],r,i,t,m[1026][1026],x[1026],n,j;
int main()
{
f>>t>>n;
for(i=1;i<=t;i++)
f>>a[i];
for(i=1;i<=n;i++)
f>>b[i];
for(i=1;i<=t;i++)
{
for(j=1;j<=n;j++)
{
if(a[i]==b[j]) m[i][j]=m[i-1][j-1]+1;
else if( m[i-1][j]>m[i][j-1]) m[i][j]=m[i-1][j];
else m[i][j]=m[i][j-1];
}
}
i=t;
j=n;
while(i!=0)
if(a[i]==b[j])
{x[r++]=a[i];
i--;
j--;
}
else if(m[i-1][j]<m[i][j-1])
j--;
else i--;
g<<r<<'\n';
for(i=r-1;i>=0;i--) g<<x[i]<<" ";
return 0;
}