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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,v[1030][1030],a[1030],b[1030],sol[1030],k=0;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
{
fin>>a[i];
}
for(int i=1;i<=m;i++)
{
fin>>b[i];
}
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
v[i][j]=v[i-1][j-1]+1;
else
v[i][j]=max(v[i-1][j],v[i][j-1]);
}
}
fout<<v[n][m];
int i=n,j=m;
while(i && j && v[i][j])
{
if(a[i]==b[j])
{
sol[++k]=a[i];
i--;
j--;
}
else
{
if(v[i-1][j]>v[i][j-1])
{
i--;
}
else
j--;
}
}
fout<<"\n";
for(int i=k;i>=1;i--)
fout<<sol[i]<<" ";
return 0;
}