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