N=int(input())
S=input()
D=[0]*26 
for s in S:
  ss=ord(s)-ord('A')
  D[ss]+=1

ans=[]
for d in D:
  ans.append(str(d))
print(''.join(ans))
#A,B,X=map(int, input().split())
#X=list(map(int, input().split()))