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#include <bits/stdc++.h>
using namespace std;
ifstream fin("cmlsc.in");
ofstream fout("cmlsc.out");
int a[1010] , b[1010];
int c[1010],k;
int main()
{
int i,m,j,m1;
fin >> m >>m1;
for(i=1; i<=m; i++)
fin >> a[i];
for(i=1 ;i<=m1; i++)
fin >> b[i];
sort(a+1,a+m+1);
sort(b+1,b+m1+1);
i = j = 1;
while(i <= m && j <= m1)
{
if(a[i] == b[j])
{
c[++k] = a[i];
i++;
j++;
}
else if(a[i] < b[j]) i++;
else j++;
}
fout << k << "\n";
for(i=1; i<=k; i++)
fout << c[i] << " ";
return 0;
return 0;
}