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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int m,n,a[1030],b[1030],dp[1030][1030],sol[1030],maxim;
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';
maxim=dp[n][m];
int i=n,j=m;
while(i&&j)
{
if(a[i]==b[j])
{
sol[maxim]=a[i];
maxim--;
i--;
j--;
}
else
{
if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
}
}
for(int i=1;i<=dp[n][m];++i)
g<<sol[i]<<' ';
return 0;
}