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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],i,j,d[1025][1025],k;
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int j=1;j<=m;j++)
f>>b[j];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
}
int i=n;j=m;
while(i and j)
{
if(a[i]==b[j])
{
v[++k]=b[j];
i--;
j--;
}
if(d[i-1][j]<d[i][j-1])
j--;
else
i--;
}
g<<d[n][m]<<'\n';
for(int i=k;i>=1;i--)
g<<v[i]<<" ";
return 0;
}