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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,i,j,q[1026][1026],a[1026],b[1026],v[10000000];
int main()
{
f>>m>>n;
for(i=1;i<=m;i++)
f>>a[i];
for(j=1;j<=n;j++)
f>>b[i];
for(i=1;i<=m;i++)
for(j=1;j<=n;j++)
if(a[i]==b[j]) q[i][j]=q[i-1][j-1];
else q[i][j]=max(q[i-1][j],q[i][j-1]);
i=m;
j=n;
while(i>=1&&j>=1)
{
if(a[i]==b[j]){v[q[i][j]]=a[i]; i--;j--;}
else if(q[i-1][j]>q[i][j-1]) i--;
else j--;
}
g<<q[n][m]<<'\n';
for(i=1;i<=q[n][m];i++) g<<v[i]<<" ";
return 0;
}