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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int N,M,A[1030],B[1030],Dp[1030][1030];
int sir[1030],bst;
int main()
{
f>>N>>M;
for(int i=1; i<=N; i++)
f>>A[i];
for(int i=1; i<=M; i++)
f>>B[i];
for(int i=1; i<=N; i++)
for(int j=1; j<=M; j++)
{
if(A[i]==B[j])
Dp[i][j]=Dp[i-1][j-1]+1;
else Dp[i][j]=max(Dp[i-1][j],Dp[i][j-1]);
}
int i=N,j=M;
while(i>0 && j>0)
{
if(A[i]==B[j])
{
sir[bst++]=A[i];
i--;
j--;
}
else
{
if(Dp[i-1][j]>Dp[i][j-1])
i--;
else j--;
}
}
g<<bst<<'\n';
for(int i=bst-1; i>=0; i--)
g<<sir[i]<<" ";
return 0;
}