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