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#include <bits/stdc++.h>
using namespace std;
ifstream fin("litere.in");
ofstream fout("litere.out");
int n;
char s[10005];
void read()
{
fin >> n;
fin >> s;
}
void solve()
{
int cont = 0;
for(int i = 0; i < n - 1; i ++)
{
for(int j = i + 1; j < n; j ++)
{
if(s[i] > s[j])
{
swap(s[i], s[j]);
cont++;
}
}
}
fout << cont;
fout << '\n' << s;
}
int main()
{
read();
solve();
return 0;
}