local s = io.read()
local n = #s
local one, two = {}, {}
one[1], two[1] = {}, {}
for i = 1, 26 do
  one[1][i], two[1][i] = 0LL, 0LL
end
local ans = 0LL
for i = 1, n do
  one[i + 1], two[i + 1] = {}, {}
  for j = 1, 26 do
    one[i + 1][j] = one[i][j]
    two[i + 1][j] = two[i][j]
  end
  local b = s:byte(i) - 64
  one[i + 1][b] = one[i][b] + 1LL
  two[i + 1][b] = two[i][b] + one[i][b]
  for j = 1, 26 do
    if j ~= b then
      ans = ans + two[i][j]
    end
  end
end
ans = tostring(ans):gsub("LL", "")
print(ans)