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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
const int N=1025;
int n,m,a[N],b[N],d[N][N],sol[N];
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++)
f>>a[i];
for(int j=1;j<=m;j++)
f>>b[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(a[i]!=b[j])
d[i][j]=max(d[i-1][j],d[i][j-1]);
else
d[i][j]=d[i-1][j-1]+1;
}
int k=d[n][m];
g<<k<<'\n';
int i=n,j=m;
while(d[i][j]!=0)
{
if(a[i]==b[j])
{
sol[d[i][j]]=a[i];
i--;j--;
}
else
if(d[i-1][j]>=d[i][j-1])
i--;
else
j--;
}
for(int i=1;i<=k;i++)
g<<sol[i]<<' ';
return 0;
}