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#include<bits/stdc++.h>
#define NMAX 1025
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[NMAX],b[NMAX],dp[NMAX][NMAX],afis[NMAX],nr;
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])
dp[i][j]=1+dp[i-1][j-1];
else
dp[i][j]+=max(dp[i][j-1],dp[i-1][j]);
}
}
for(int i=n,j=m;i;)
{
if(a[i]==b[j])
afis[++nr]=a[i],i--,j--;
else
if(dp[i-1][j]<dp[i][j-1])
j--;
else
i--;
}
g<<nr<<'\n';
for(int i=nr;i;--i)
g<<afis[i]<<' ';
}