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#include <fstream>
#define N 1030
#include <iostream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int A[N],B[N],din[N][N];
void solve(int m, int n)
{
if(din[m][n])
{
if(A[m]==B[n])
{
solve(m-1,n-1);
g<<A[m]<<' ';
}
else
if(din[m-1][n]>din[m][n-1]) solve(m-1,n);
else solve(m,n-1);
}
}
int main()
{
int a,b;
f>>a>>b;
for(int i=1;i<=a;++i) f>>A[i];
for(int j=1;j<=b;++j) f>>B[j];
for(int i=1;i<=a;++i)
for(int j=1;j<=b;++j)
if(A[i]==B[j]) din[i][j]=1+din[i-1][j-1];
else din[i][j]=max(din[i-1][j],din[i][j-1]);
g<<din[a][b]<<'\n';
solve(a,b);
f.close();
g.close();
return 0;
}