file = open('2.txt')
A = file.readline()
l = 1
ans = 0
k = 0
for r in range(1, len(A)):
    if A[r-1] == 'A' and A[r] == 'B':
        k += 1
    while k >= 1:
        if A[l-1] == 'A' and A[l] == 'B':
            k -= 1
        l += 1
    ans = max(ans, (r - 1) - l + 1)
print(ans)

Max = 0
A = A.replace('AB', 'A B')
A = list(map(str, A.split()))
for elem in A:
    Max = max(Max, len(elem))
print(Max)