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