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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int a[1025],b[1025],x[1025][1025];
int n,m;
void cmlsc()
{
int i,j;
for(i=1;i<=n;i++)
for(j=1;j<=m;j++)
if(a[i]==b[j])
x[i][j]=x[i-1][j-1]+1;
else
x[i][j]=max(x[i-1][j],x[i][j-1]);
g<<x[n][m]<<"\n";
}
stack <int> y;
void sol()
{
int i=n,j=m;
while(x[i][j])
{
if(a[i]==b[j])
y.push(a[i]),i--,j--;
else
if(x[i][j]==x[i-1][j])
i--;
else
j--;
}
}
void afis()
{
while(!y.empty())
g<<y.top()<<" ",y.pop();
}
int main()
{
f>>n>>m;
int i,j;
for(i=1;i<=n;i++)
f>>a[i];
for(j=1;j<=m;j++)
f>>b[j];
cmlsc();
sol();
afis();
return 0;
}