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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1030],b[1030],dp[1030][1030],sir[1030],nr=0;
int main()
{
f>>n>>m;
for(int i=1;i<=n;i++) f>>a[i];
for(int i=1;i<=m;i++) f>>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]);
g<<dp[n][m]<<'\n';
for(int i=n,j=m;i>=1&&j>=1;)
{
if( a[i]==b[j] ) sir[++nr]=a[i],i--,j--;
else{
if( dp[i-1][j]>=dp[i][j-1] ) i--;
else j--;
}
}
for(int i=nr;i>=1;i--) g<<sir[i]<<' ';
}