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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in") ;
ofstream fout("cmlsc.out") ;
int n , m , v[1030] , a[1030] , c[1030] , i , j , d[1030][1030] , k;
int main()
{
fin >> n >> m ;
for(int i=1; i<=n; i++)
fin >> v[i] ;
for(int i=1; i<=m; i++)
fin >> a[i] ;
for(int i=1; i<=n; i++)
for(int j=1; j<=m; j++)
{
if(v[i] == a[j])
d[i][j] = d[i-1][j-1] + 1 ;
else
d[i][j] = max(d[i-1][j] , d[i][j-1]) ;
}
fout << d[n][m] << "\n" ;
i = n ; j = m ;
while(i>=1 && j>=1 && d[i][j] != 0)
{
if(v[i] == a[j])
{
k ++ ;
c[k] = a[j] ;
i--;
j--;
}
else if (d[i-1][j] < d[i][j-1])
j-- ;
else
i-- ;
}
for(i=k; i>=1; i--)
fout << c[i] << " ";
return 0;
}