#include <iostream>

using namespace std;

int main()
{
	cin.tie(nullptr);
	ios::sync_with_stdio(false);
	unsigned int N, i, C[26] = { 0, };
	char S[100001];

	cin >> N >> S;
	for (i = 0; i != N; ++i)
		++C[S[i] - 'A'];

	for (i = 0; i != 26; ++i)
		cout << C[i];

	cout << '\n';
	return 0;
}