# Assertion
A = [ord(a) - 97 for a in input()]
N = len(A)

for a in A:
    assert 0 <= a < 26
assert 1 <= N <= 2 * 10 ** 5

P = 10 ** 9 + 7
X = [0] * 26
po2 = [1]
for _ in range(N):
    po2.append(po2[-1] * 2 % P)
ans = 0
for i, a in enumerate(A):
    ans = (ans + (po2[i] - X[a]) * po2[N-i-1]) % P
    X[a] = (X[a] + po2[i]) % P

print(ans)