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///cel mai mare lexicografic subsir comun
#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],ma=0;
void solve(int m, int n, int lg)
{
int l=0,c=0;
ma=0;
for(int i=1;i<=m;++i)
for(int j=1;j<=n;++j)
if(A[i]==B[j] && lg==din[i][j])
{
if(A[i]>ma)
{
ma=A[i];
l=i;
c=j;
}
}
if(ma && din[l][c])
{
g<<A[l]<<' ';
solve(l-1,c-1,lg-1);
}
}
int main()
{
int a,b;
f>>a>>b;
for(int i=a;i>=1;--i) f>>A[i];
for(int j=b;j>=1;--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,din[a][b]);
f.close();
g.close();
return 0;
}