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#include <iostream>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,top;
int st[1029], a[1029], b[1029], dp[1029][1029];
int main()
{
fin>>n>>m;
for(int i=1; i<=n; i++)
fin>>a[i];
for(int 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]);
fout<<dp[N][M]<<"\n";
int i=n, j=m;
while(i&&j)
{
if(a[i]==b[j])
st[++top]=a[i],i--,j--;
else if(dp[i-1][j]>dp[i][j-1])
i--;
else j--;
}
for(i=top;i>=1;i--)
fout<<st[i]<<" ";
return 0;
}