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#include <fstream>
#include <vector>
using namespace std;
ifstream in("cmlsc.in");
ofstream out("cmlsc.out");
vector<int>rez;
int a[1030],b[1030],mat[1030][1030],n,m,i,j;
int main()
{
in>>m>>n;
for(i=1;i<=m;i++)
{
in>>a[i];
}
for(j=1;j<=n;j++)
{
in>>b[j];
}
for(i=1;i<=m;i++)
{
for(j=1;j<=n;j++)
{
if(a[i]==b[j])
mat[i][j]=mat[i-1][j-1]+1;
else if(mat[i][j-1]<=mat[i-1][j])
mat[i][j]=mat[i-1][j];
else if(mat[i-1][j]<mat[i][j-1])
mat[i][j]=mat[i][j-1];
}
}
i=m;
j=n;
while(i>0 && j>0)
{
if(a[i]==b[j])
{
rez.push_back(a[i]);
i--;
j--;
}
else if(mat[i][j-1]>=mat[i-1][j])
{
j--;
}
else
{
i--;
}
}
out<<mat[m][n]<<'\n';
for(i=rez.size()-1;i>=0;i--)
out<<rez[i]<<' ';
out<<'\n';
return 0;
}