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#include <fstream>
using namespace std;
ifstream cin ("cmlsc.in");
ofstream cout ("cmlsc.out");
int n,m,i,j,a[1030],b[1030],c[1030],dp[1030][1030],k;
void recursiv(int i, int j)
{
if(dp[i][j]>0)
{
if(a[i]==b[j])
{
recursiv(i-1,j-1);
k++;
c[k]=a[i];
}
else
if(dp[i-1][j]>dp[i][j-1])
recursiv(i-1,j);
else
recursiv(i,j-1);
}
}
int main()
{
cin>>n>>m;
for(i=1; i<=n; i++)
cin>>a[i];
for(i=1; i<=m; i++)
cin>>b[i];
for(i=1; i<=n; i++)
for(j=1; j<=m; j++)
{
if(a[i]==b[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
}
recursiv(n,m);
cout<<k<<endl;
for(i=1;i<=k;i++)
cout<<c[i]<<' ';
return 0;
}