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#include <iostream>
#include<fstream>
using namespace std;
int l[111][111],a[111],b[111],c[111],k;
int maxim(int a,int b)
{
int max;
if(a>=b)
max=a;
else
max=b;
return max;
}
int construire(int i,int j)
{
if(i>=1 && j>=1)
{
if(a[i]==b[j])
{
construire(i-1,j-1);
k++;
c[k]=a[i];
}
else
{
if(l[i-1][j]>l[i][j-1])
construire(i-1,j);
else
construire(i,j-1);
}
}
}
int main()
{
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int n,m,i,j;
f>>n>>m;
for(i=1;i<=n;i++)
f>>a[i];
for(i=1;i<=m;i++)
f>>b[i];
for(i=0;i<=n;i++)
{
for(j=0;j<=m;j++)
{
if(i==0 || j==0)
l[i][j]=0;
if(a[i]==b[j])
l[i][j]=1+l[i-1][j-1];
else
l[i][j]=maxim(l[i-1][j],l[i][j-1]);
}
}
k=0;
construire(n,m);
g<<k<<" ";
g<<endl;
for(i=1;i<=k;i++)
g<<c[i]<<" ";
return 0;
}