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#include <bits/stdc++.h>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int d[1027][1027],a[1027],b[1027],v[1027],n,m,i,j,k;
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<=m;i++)
for(j=1;j<=n;j++)
{
if(b[i]==a[j])
d[i][j]=1+d[i-1][j-1];
else
d[i][j]=max(d[i-1][j],d[i][j-1]);
}
g<<d[m][n]<<'\n';
while(m!=0&&n!=0)
{
if(a[n]==b[m])
{
v[++k]=a[n];
m--;
n--;
}
else
if(d[m-1][n]>d[m][n-1])
m--;
else
n--;
}
for(i=k;i>=1;i--)
g<<v[i]<<" ";
return 0;
}