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#include <iostream>
#include <cmath>
#include <fstream>
using namespace std;
ifstream f("cmlsc.in");
ofstream g("cmlsc.out");
int c[100][100],a[100],b[100],x,y,m,n,i,j,h,d[100];
int main()
{
f>>n>>m;
for(i=1; i<=n; i++)
f>>a[i];
for(j=1; j<=m; j++)
f>>b[j];
for(j=1; j<=m; j++)
for(i=j; i<=m; i++)
if(a[i]==b[j])
c[1][j]=1;
for(i=1; i<=n; i++)
for(j=1; j<n; j++)
if(b[j]==a[i])
c[i][1]=1;
for(i=2; i<=n; i++)
for(j=2; j<=m; j++)
if(a[i]==b[j])
c[i][j]=1+c[i-1][j-1];
else
c[i][j]=max(c[i-1][j],c[i][j-1]);
g<<c[n][m]<<" ";
x=n;
y=m;
h=0;
while(x>0 && y>0)
{
if(a[x]==b[y])
{
d[++h]=a[x];
x--;
y--;
}
if(c[x-1][y]>c[x][y-1])
x--;
else
y--;
}
for(i=h;i>=1;i--)
g<<d[i]<<" ";
return 0;
}