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ryupy/main.py

Created December 16, 2018 13:45
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main.py
S = input()
N = len(S)
sum = 0
count = 0
flg = False
S = S[::-1]
for i in range(N):
if S[i] == 'W':
count += 1
flg = True
elif S[i] == 'B' and flg:
sum += count
print(sum)
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