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#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1030][1030];
int v[1030],z[1030];
int main()
{
int n,m,i,j,cnt=0,nr=0;
f>>n;
f>>m;
for(i=1;i<=n;++i)
f>>v[i];
for(i=1;i<=m;++i)
f>>z[i];
for(i=1;i<=n;++i)
{
cnt=0;
for(j=1;j<=m;++j)
{
if(v[i]==z[j])
{
cnt++;
a[i][j]=cnt;
}
else if(cnt<a[i-1][j])
{
cnt=a[i-1][j];
a[i][j]=cnt;
}
else
a[i][j]=cnt;
}
}
g<<a[n][m]<<'\n';
while(i>=1 && j>=1)
{
if(v[i]==z[j])
{
nr=nr*10+v[i];
i--;
j--;
}
else if(a[i-1][j]>a[i][j-1])
i--;
else if(a[i-1][j]<a[i][j-1])
j--;
else
i--;
}
while(nr)
{
g<<nr%10<<" ";
nr/=10;
}
return 0;
}