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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int i,j,n,m,k;
int v[1050][1050],a[1050],b[1050];
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
for(i=1;i<=n;i++)
for(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][j-1],v[i-1][j]);
}
g<<v[n][m]<<"\n";
k=1;
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(v[i][j]==k)
{
k++;
g<<a[i]<<" ";
}
}
}
return 0;
}