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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,n,m,a[200005],b[200005],mat[1024][1024];
int v[200005],numara=0;
int main()
{
fin>>n>>m;
for(i=1;i<=n;++i)
{
fin>>a[i];
}
for(j=1;j<=m;++j)
{
fin>>b[j];
}
for(i=1;i<=n;++i)
{
for(j=1;j<=m;++j)
{
if(a[i]==b[j])
{
mat[i][j]=mat[i-1][j-1]+1;
}
else{
mat[i][j]=max(mat[i-1][j],mat[i][j-1]);
}
}
}
fout<<mat[n][m]<<endl;
i=n;
j=m;
while(i>=1 && j>=1)
{
if(a[i]==b[j])
{
v[numara++]=a[i];
i--;
j--;
}
else if(mat[i-1][j]<mat[i][j-1])
{
j--;
}
else{
i--;
}
}
for(i=numara-1;i>=0;--i)
{
fout<<v[i]<<" ";
}
return 0;
}