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#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n, m, a[1040], b[1040], i, j, rez[1040], nr, c[1040][1040];
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(a[i]==b[j])
c[i][j]=c[i-1][j-1]+1;
else c[i][j]=max(c[i-1][j],c[i][j-1]);
}
/*for(i=1;i<=n;i++)
{for(j=1;j<=m;j++)
cout<<c[i][j]<<' '; cout<<endl;}*/
fout<<c[n][m]<<'\n';
for(i=1;i<=c[n][m];i++)
fout<<rez[i]<<' ';
return 0;
}