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#include <fstream>
#include<algorithm>
using namespace std;
ifstream f("cmlsc.in"); ofstream g("cmlsc.out");
int m,n,vmax,a[1045],b[1045],dp[1045][1045],sir[1045];
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';
int i=n,j=m;
while(i&&j)
{
if(a[i]==b[j]) sir[++vmax]=a[i],--i,--j;
else if(dp[i-1][j]==dp[i][j]) i--;
else j--;
}
for(i=vmax;i;i--) g<<sir[i]<<' ';
g.close();
return 0;
}