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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int n,m,i,j,a[1025],b[1025],dp[1025][1025],sol[1025],l;
int main()
{
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]);
fout<<dp[n][m]<<'\n';
l=dp[n][m];
i=n;
j=m;
while(l)
{
if(a[i]==b[j])
{
sol[l]=a[i];
l--;
i--;
j--;
}
else
if(dp[i-1][j]>dp[i][j-1]) i--;
else j--;
}
for(i=1;i<=dp[n][m];i++)
fout<<sol[i]<<" ";
return 0;
}