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