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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
short n,m,a[1025],b[1025],A[1025][1025];
list<short> l;
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
{
f>>a[i];
}
for(int i=1;i<=m;i++)
f>>b[i];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]==b[j]) {A[i][j]=1+A[i-1][j-1];
l.push_back(a[i]);}
else A[i][j]=max(A[i-1][j],A[i][j-1]);
}
g<<A[n][m]<<'\n';
for(auto i:l)
g<<i<<" ";
return 0;
}