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#include <iostream>
#include <fstream>
using namespace std;
int A[1025] , B[1025] , M[1025][1025] , R[1025];
int N , P;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int main()
{
fin >> N >> P;
for(int i = 1 ; i <= N ; ++i)
{
fin >> A[i];
}
for(int j = 1 ; j <= P ; ++j)
{
fin >> B[j];
}
for(int i = 1 ; i <= N ; ++i)
{
for(int j = 1 ; j <= P ; ++j)
{
if(A[i] == B[j])
{
M[i][j] = M[i - 1][j - 1] + 1;
}
else
{
M[i][j] = max(M[i - 1][j] , M[i][j - 1]);
}
}
}
fout << M[N][P] << "\n";
int i = N , j = P , K = 0;
while(M[i][j] != 0)
{
if(M[i][j] == M[i - 1][j])
{
i --;
}
if(M[i][j] == M[i][j - 1])
{
j --;
}
else
{
R[++K] = B[j];
i--;
j--;
}
}
for(i = K ; i >= 1 ; i--)
{
fout << R[i] << " ";
}
return 0;
}