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#include<fstream>
#define N 1001
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int x[N][N],t[N];
int main()
{
int i,j,n,m,v[N],w[N];
f>>n>>m;
for(i=1;i<=n;i++)
f>>v[i];
for(i=1;i<=m;i++)
f>>w[i];
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
{
if(v[i]==w[j])
x[i][j] = 1+x[i-1][j-1];
else
{
if(x[i-1][j] > x[i][j-1])
x[i][j] = x[i-1][j];
else
x[i][j] = x[i][j-1];
}
}
i=n;
j=m;
while(i!=0 && j!=0)
if(v[i]==w[j])
{
t[++t[0]]=v[i];
--i;
--j;
}
else
if(x[i-1][j]<x[i][j-1])
--j;
else
--i;
g<<t[0]<<'\n';
for(i=t[0];i;i--)
g<<t[i]<<" ";
return 0;
}