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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],v[1025][1025],sir[1025],i,j,k;
int main()
{
f>>n>>m;
for(int i=1; i<=n; i++)
f>>a[i];
for(int i=1; i<=m; i++)
f>>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]);
}
}
int i=n,j=m;
while(i and j)
{
if(a[i]==b[j])
sir[++k]=a[i],i--,j--;
else if(v[i-1][j]<v[i][j-1])
j--;
else
i--;
}
g<<k<<'\n';
for(int i=k; i>=1; i--)
g<<sir[i]<<" ";
return 0;
}