s=input()
n=len(s)
cum=[[0]*26]
for i,c in enumerate(s):
    tmp=cum[-1][:]
    tmp[ord(c)-ord('A')]+=1
    cum.append(tmp)
ans=0
for i,c in enumerate(s):
    ima_c=cum[i][ord(c)-ord('A')]
    zenbu_c=cum[-1][ord(c) - ord('A')]
    ans+=ima_c*(n-i-zenbu_c+ima_c)
print(ans)