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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];
void rfcsbs(int i,int j)
{
if(i==0 || j==0)
return;
if(a[i]==b[j])
{
rfcsbs(i-1,j-1);
g<<a[i]<<" ";
}
else
{
if(A[i-1][j]>A[i][j-1])
rfcsbs(i-1,j);
else rfcsbs(i,j-1);
}
}
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];
else A[i][j]=max(A[i-1][j],A[i][j-1]);
}
g<<A[n][m]<<'\n';
rfcsbs(n,m);
return 0;
}