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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int d[1025][1025],a[257],b[257],c[257];
int main()
{
int n,m,i,j,k=0;
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<=m; i++)
for(j=1; j<=n; j++)
{
if(b[i]==a[j])
{
d[i][j]=1+d[i-1][j-1];
c[++k]=b[i];
}
if(b[i]!=a[j])
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
g << d[m][n] << '\n';
for(i=1;i<=k;i++)
g << c[i] << " ";
return 0;
}