s = input()
count_k = s.count('k')
if count_k == 0:
print(0)
elif count_k == 1:
print(s.index('k') + 1)
else:
print(count_k)
cyA9IGlucHV0KCkKCmNvdW50X2sgPSBzLmNvdW50KCdrJykKCmlmIGNvdW50X2sgPT0gMDoKICAgIHByaW50KDApCmVsaWYgY291bnRfayA9PSAxOgogICAgcHJpbnQocy5pbmRleCgnaycpICsgMSkKZWxzZToKICAgIHByaW50KGNvdW50X2sp