from collections import defaultdict
S  = str(input())
dis = defaultdict(list)
for i in range(len(S)):
  dis[S[i]].append(i + 1)

ans = 0
for i in dis.keys():
  if len(dis[i]) >= 2:
    for j in range(1, len(dis[i])):
      ans += (len(S) - dis[i][j] - (len(dis[i]) - j - 1)) * j

print(ans)