while True:
try:
ddd = input()
print(ddd)
k = int(input().strip())
d = input().strip()
dd = ''
for i in d:
if i>='a':
dd+='0'
else:
dd+='1'
s = ''
c = 0
is0 = True
isEnd = False
while not isEnd:
if is0:
s += '0'*k
if s in dd:
c += k
else:
isEnd = True
else:
s += '1'*k
if s in dd:
c +=k
else:
isEnd = True
is0 = not is0
print(c)
except:
break
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