main = interact $ f" "0 b="([{<" d=")]}>" y=cycle (!)=elem f(e:c)n(x:r)|x!b=y b!!n:f(y d!!n:e:c)(n+1)r|x!d=e:f c(n-1)r|1<3=x:f(e:c)n r f c n s=s