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