def sub(s1): res = [s1[i: j] for i in range(len(s1)) | CODING SOLUTION - Placement Jobs & Materials

def sub(s1):
res = [s1[i: j] for i in range(len(s1))
for j in range(i + 1, len(s1) + 1)]
return res


n = int(input())
s1 = input()
ans = sub(s1)
c = 0
for i in ans:
if 'beauty' in i:
if 'brain' in i:
c += 1
print(c)

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