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#include <iostream>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int dp[1025][1025],v1[1025],v2[1025],n,m,sol[1030],vf;
int main()
{
f >> n>> m;
for(int i=1;i<=n;i++)
f >> v1[i];
for(int j=1;j<=m;j++)
f>> v2[j];
for(int i=1;i<=n;i++)
for(int j=1;j<=m;j++)
{
if(v1[i]==v2[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";
int i=n,j=m;
while(i && j)
{
if(v1[i]==v2[j])
{
sol[vf++]=v1[i];
i--;
j--;
}
if(dp[i][j]==dp[i-1][j])
i--;
else j--;
}
for(int i=vf-1;i>=0;i--)
g << sol[i] << " ";
return 0;
}