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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1025],b[1025],d[1025][1025];
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])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
g<<d[n][m]<<endl;
int i=n,j=m,k=0,t[1025];
while(i>0 && j>0)
{
if(a[i]==b[j])
{
t[++k]=a[i];
i--;
j--;
}
else
if(d[i][j-1] > d[i-1][j])
j--;
else
i--;
}
for(int i=k;i>=1;i--)
g<<t[i]<<" ";
return 0;
}