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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int LCS[1025][1025],i,j,A[1025],B[1025],n,m,sub,dr[1025];
int main()
{
fin>>n>>m;
for(i=1;i<=n;i++)
{
fin>>A[i];
}
for(i=1;i<=m;i++)
{
fin>>B[i];
}
for(i=1;i<=n;i++)
{
for(j=1;j<=m;j++)
{
if(B[j]==A[i])
{
LCS[i][j]=LCS[i-1][j-1]+1;
}else LCS[i][j]=max(LCS[i-1][j],LCS[i][j-1]);
}
}
i=n;
j=m;
while(i)
{
if(A[i]==B[j])
{
dr[++sub]=A[i];
i--;
j--;
}else{
if(LCS[i-1][j]<LCS[i][j-1])j--;
else i--;
}
}
fout<<sub<<'\n';
for(i=sub;i>=1;i--)
{
fout<<dr[i]<<" ";
}
return 0;
}