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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
long long n,m,i,j,a[1050],b[1050],dp[1050][1050];
void recons(int N, int M, int k)
{
if(k>0)
{
if(a[N]==b[M])
{
recons(N-1,M-1,k-1);
g<<a[N]<<" ";
}
else
{
if(dp[N-1][M]>=dp[N][M-1])recons(N-1,M,k);
else recons(N,M-1,k);
}
}
}
int main()
{
f>>n>>m;
for(i=1;i<=n;i++)f>>a[i];
for(i=1;i<=m;i++)f>>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]);
}
}
g<<dp[n][m]<<'\n';
recons(n,m,dp[n][m]);
return 0;
}