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#include<bits/stdc++.h>
using namespace std;
int n,m,a[1025],b[1025],q,d[1029][1029],c[1025],k=1;
int main(){
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
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])
d[i][j]=d[i-1][j-1]+1;
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
}
g<<d[n][m] << '\n';
while(n >= 1 && m >= 1)
{
//g << n << " " << m << '\n';
if(d[n][m] - 1 == d[n - 1][m - 1])
{
c[k]=a[n];
k++;
n--;
m--;
}
else if(d[n - 1][m] >= d[n][m - 1])
n--;
else
m--;
}
for(int i=k-1;i>=1;i--)
g<<c[i]<<" ";
}