from collections import defaultdict

s = input()
dn = defaultdict(int)
di = defaultdict(list)
ls = len(s)

for i in range(ls):
    dn[s[i]] += 1
    di[s[i]].append(i + 1)

alp = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
ans = 0
for i in alp:
    if dn[i] > 1:
        for j in range(1,dn[i]):
            ans += (ls - di[i][j] - (dn[i] - (j + 1))) * j

print(ans)