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