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#include <bits/stdc++.h>
std::ifstream fin("cmlsc.in");
std::ofstream fout("cmlsc.out");
int a[1025];
int b[1025];
int mat[1025][1025], n, m;
bool ap[257];
int sol[1025];
void afisare()
{
for(int i = 1; i <= n; i++,fout <<'\n')
for(int j = 1; j <= m ; j++)
fout << mat[i][j] << ' ';
}
int main()
{
int k = 0;
fin >> n >> m;
for(int i = 1; i <= n; i++){
fin >> a[i];
}
for(int j = 1; j <= m; j++){
fin >> b[j];
}
int maxi = 0;
for(int i = 1; i <= n; i++)
{
for(int j = 1; j <= m; j++){
mat[i][j] = std::max(mat[i - 1][j] * (i - 1 >= 1) , mat[i][j - 1] * (i - 1 >= 1) ) + (a[i] == b[j]);
if(mat[i][j] > maxi)
{
maxi = mat[i][j];
sol[++k] = a[i];
}
}
}
fout << maxi << '\n';
for(int i = 1; i <= k; i++)
fout << sol[i] << ' ';
//afisare();
return 0;
}