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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int D[1025][1025], m, n, A[1025], B[1025], i, j, sir[1025], nr = 0;
int main()
{
fin >> m >> n;
for(i = 1; i <= m; i++)
fin >> A[i];
for(i = 1; i <= n; i++)
fin >> B[i];
for(i = 1; i <= m; i++)
for(j = 1; j <= n; 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]);
while(i > 0 && j > 0)
if(A[i] == B[j])
{
sir[++nr] = A[i];
--i;
--j;
}
else if(D[i - 1][j] < D[i][j - 1])
--j;
else --i;
fout << nr << endl;
for(i = nr; i >= 1; --i)
fout << sir[i] << " ";
}