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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,a[1030],b[1030],dp[1025][1025];
void citire()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>b[i];
}
void solutie()
{
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;
else dp[i][j]=max(dp[i][j-1],dp[i-1][j]);
}
fout<<dp[n][m]<<"\n";
int i=n,j=m;
int sol[1030],nr=0;
while(i>=1 && j>=1)
{
if(a[i]==b[j])
{
sol[++nr]=a[i];
i--;
j--;
}
else if(dp[i][j-1]>dp[i-1][j])
j--;
else i--;
}
for(int i=nr;i>=1;i--)
fout<<sol[i]<<" ";
}
int main()
{
citire();
solutie();
return 0;
}