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#include<fstream>
#include<algorithm>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1040],b[1040],d[1040][1040],i,j,n,m,sir[1040],nr;
int main()
{
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]);
}
i=n;
j=m;
while(i!=0&&j!=0)
{
if(a[i]==b[j])
{
sir[++nr]=a[i];
i--;
j--;
}
else
{
if (d[i-1][j] < d[i][j-1])
j--;
else
i--;
}
}
g<<nr<<'\n';
for(i=nr;i>=1;i--)
g<<sir[i]<<' ';
return 0;
}