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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1025],b[1025],dp[1025][1025],m,n,lungime;
stack<int> sol;
int main()
{
fin>>n>>m;
for(int i=1;i<=n;i++)
fin>>a[i];
for(int i=1;i<=m;i++)
fin>>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]);
int i=n,j=m;
while(i>0 && j>0)
if(a[i]==b[j])
{
lungime++;
sol.push(a[i]);
i--;
j--;
}
else if(dp[i-1][j]>dp[i][j-1])
i--;
else
j--;
fout<<lungime<<'\n';
while(!sol.empty())
{
fout<<sol.top()<<' ';
sol.pop();
}
/*for(int i=1;i<=n;i++,fout<<'\n')
for(int j=1;j<=m;j++)
fout<<dp[i][j]<<' ';*/
return 0;
}
/*
l
5784592322223
321875423294
c
*/