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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[2025][2025],n,m,v1[2025],v2[2025];
int main()
{
f>>n>>m;
for(int i=1; i<=n; i++)
f>>v1[i];
for(int i=1; i<=m; i++)
f>>v2[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(v1[i]==v2[j])
a[i][j]=a[i-1][j-1]+1;
else
a[i][j]=max(a[i-1][j],a[i][j-1]);
g<<a[n][m]<<'\n';
stack<int> S;
for(int i=n; i>0;)
for(int j=m; j>0;)
{
if(v1[i]==v2[j])
S.push(v1[i]),i--,j--;
else
{
if(a[i][j-1]>a[i-1][j])
j--;
else
i--;
}
}
while(!S.empty())
g<<S.top()<<' ',S.pop();
return 0;
}