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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,v[2000],h[2000];
int dp[2000][2000];
int main()
{
f>>n>>m;
for(int i=1; i<=n; i++)
f>>v[i];
for(int i=1; i<=m; i++)
f>>h[i];
for(int i=1; i<=n; i++)
for(int j=1; j<=n; j++)
if(v[i]==h[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i][j-1],dp[i-1][j]);
g<<dp[n][m]<<endl;
int p=0;
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
if(dp[i][j]>p)
{
g<<v[i]<<" ";
p=dp[i][j];
}
return 0;
}