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#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int dp[1030][1030], m, n, s1[1030], s2[1030], rez[1030], cont;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>s1[i];
for(int i=1;i<=m;i++)
fin>>s2[i];
for(int i=1;i<=n;i++)
{
for(int j=1;j<=m;j++)
{
if(s1[i]==s2[j])
dp[i][j]=dp[i-1][j-1]+1;
else
dp[i][j]=max(dp[i-1][j],dp[i][j-1]);
}
}
fout<<dp[n][m]<<'\n';
cont=dp[n][m];
int x=n, y=m;
while(x>=1 && y>=1)
{
if(s1[x]==s2[y])
{
rez[cont]=s1[x];
cont--;
x--;
y--;
}
else
{
if(dp[x][y-1]>=dp[x-1][y])
y--;
else
x--;
}
}
for(int i=1;i<=dp[n][m];i++)
fout<<rez[i]<<" ";
return 0;
}