from collections import defaultdict as dd

N = int(input())
S = list(input())

cnt = dd(int)
for i in range(N):
    cnt[S[i]] += 1

alp = [chr(65+i) for i in range(26)]
#print(ord("A"))
ans = ""
for i in alp:
    ans += str(cnt[i])
print(ans)