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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1030],b[1030],dp[1030][1030], f[1030];
int main()
{
int m,n,i,j,t;
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++)
{
dp[i][j]=max(dp[i-1][j], dp[i][j-1]);
if(a[i]==b[j])
{
dp[i][j]=max(dp[i][j],dp[i-1][j-1]+1);
}
}
}
fout<<dp[n][m]<<'\n';
i=n;
j=m;
t=1;
while(dp[i][j]>0)
{
if(dp[i][j]>dp[i-1][j] && dp[i][j]>dp[i][j-1])
{
f[t]=a[i];
t++;
i--;
j--;
}
else
if(dp[i][j]>dp[i-1][j])
j--;
else
if(dp[i][j]>dp[i][j-1])
i--;
else
i--;
}
for(i=1;i<=t-1;i++)
{
fout<<f[i]<<" ";
}
return 0;
}