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#include <bits/stdc++.h>
using namespace std;
ifstream ci("cmlsc.in");
ofstream cou("cmlsc.out");
int v[1026][1026],a[1026],b[1026],n,m;
int afis[1026];
int k;
void citire()
{
ci>>n>>m;
int i;
for(i=1; i<=n; i++)
{
ci>>a[i];
}
for(i=1; i<=m; i++)
{
ci>>b[i];
}
}
void rez()
{
int i,j;
//v[1][1]=1;
for(i=1; i<=n; i++)
{
for(j=1; j<=m; j++)
{
if(a[i]==b[j] )
{
v[i][j]=v[i-1][j-1]+1;
}
else
{
v[i][j]=max(v[i-1][j],v[i][j-1]);
}
}
}
k=v[n][m];
cou<<v[n][m]<<"\n";
i=n;j=m;
while(i&&j){
if(a[i]==b[j]){
afis[k--]=a[i];
i--;
j--;
}else{
if(v[i-1][j]>v[i][j-1] ){
i--;
}else{
j--;
}
}
}
for(int i=1;i<=v[n][m];i++ ){
cou<<afis[i]<<" ";
}
}
int main()
{
citire();
rez();
return 0;
}