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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
const int NMAX = 1025;
int a[NMAX],b[NMAX],rasp[NMAX];
int dp[NMAX][NMAX];
pair<int,int> prev[NMAX][NMAX];
int main()
{
int n,m;
fin >> n >> m;
for(int i=1;i<=n;i++) fin >> a[i];
for(int i=1;i<=m;i++) fin >> b[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(a[i]==b[j]){
dp[i][j]=dp[i-1][j-1]+1;
prev[i][j]=make_pair(i-1,j-1);
}
else{
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
if(dp[i-1][j]<dp[i][j-1])
prev[i][j]=make_pair(i,j-1);
else prev[i][j]=make_pair(i-1,j);
}
}
}
fout << dp[n][m] << '\n';
bool ok=false;
int x=n,y=m,k=0;
while(ok==false){
if(prev[x][y].first==x-1 and prev[x][y].second==y-1){
rasp[++k]=a[x];
}
x=prev[x][y].first;
y=prev[x][y].second;
if(x==0 and y==0) ok=true;
}
for(int i=k;i>=1;i--) fout << rasp[i] << ' ';
return 0;
}