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