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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int i,j,s=0,maxi=1,dp[1034][1034],n,m,a[1034],b[1034],v[1034],k=0;
int main()
{
fin>>n>>m;
for(i=1; i<=n; i++)
fin>>a[i];
for(j=1; j<=m; j++)
fin>>b[j];
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]);
}
i=n,j=m;
while(i!=0 && j!=0)
{
if(a[i]==b[j])
v[++k]=a[i],i--,j--;
else if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
fout<<k<<'\n';
for(i=k;i>=1;i--)
fout<<v[i]<<' ';
return 0;
}