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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,a[1050],b[1050],nr,dp[1050][1050],sol[1050],i,j;
int main()
{
f>>n>>m;
for(i=1; i<=n; ++i)
f>>a[i];
for(i=1; i<=m; ++i)
f>>b[i];
for(i=1; i<=n; ++i)
{
for(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]);
}
}
i=n;
j=m;
while(i && j)
{
if(a[i]==b[j])
{
sol[++nr]=a[i];
i--;
j--;
}
else if(dp[i-1][j]>dp[i][j-1])i--;
else j--;
}
g<<nr<<'\n';
for(i=nr; i>=1; i--)
g<<sol[i]<<' ';
return 0;
}