n = int(input())
s = input()
ans = [0] * 26
for i in range(len(s)):
    if s[i] == "A":
        ans[0] += 1
    if s[i] == "B":
        ans[1] += 1
    if s[i] == "C":
        ans[2] += 1
    if s[i] == "D":
        ans[3] += 1
    if s[i] == "E":
        ans[4] += 1
    if s[i] == "F":
        ans[5] += 1
    if s[i] == "G":
        ans[6] += 1
    if s[i] == "H":
        ans[7] += 1
    if s[i] == "I":
        ans[8] += 1
    if s[i] == "J":
        ans[9] += 1
    if s[i] == "K":
        ans[10] += 1
    if s[i] == "L":
        ans[11] += 1
    if s[i] == "M":
        ans[12] += 1
    if s[i] == "N":
        ans[13] += 1
    if s[i] == "O":
        ans[14] += 1
    if s[i] == "P":
        ans[15] += 1
    if s[i] == "Q":
        ans[16] += 1
    if s[i] == "R":
        ans[17] += 1
    if s[i] == "S":
        ans[18] += 1
    if s[i] == "T":
        ans[19] += 1
    if s[i] == "U":
        ans[20] += 1
    if s[i] == "V":
        ans[21] += 1
    if s[i] == "W":
        ans[22] += 1
    if s[i] == "X":
        ans[23] += 1
    if s[i] == "Y":
        ans[24] += 1
    if s[i] == "Z":
        ans[25] += 1
c = str(ans[0])
for i in range(1, 26):
    c += str(ans[i])
print(c)