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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int A[1030],B[1030],M,N,DP[1030][1030],Sol[1030],k;
void Read()
{
fin>>M>>N;
for(int i=1;i<=M;i++)
fin>>A[i];
for(int i=1;i<=N;i++)
fin>>B[i];
}
void Solve()
{
for(int i=1;i<=M;i++)
{
for(int j=1;j<=N;j++)
{
if(A[i]==B[j])
{
DP[i][j]=1+DP[i-1][j-1];
}
else
DP[i][j] = max(DP[i-1][j],DP[i][j-1]);
}
}
int i=M,j=N;
while ((i>0)&&(j>0))
{
if(A[i]==B[j])
{
++k;
Sol[k]=A[i];
--i; --j;
}
else
{
if(DP[i-1][j]>DP[i][j-1])
{
--i;
}
else --j;
}
}
}
void Print()
{
fout<<DP[M][N]<<"\n";
for(int i=k;i>=1;i--)
fout<<Sol[i]<<" ";
}
int main()
{
Read();
Solve();
Print();
return 0;
}