import Data.Either
m=map
e=[]:e
r=pure
l=Left
c=isLeft
z=zipWith
i=isRight
a=m.m.m.k
h=any$all i
a?b|c a,i b=b|let=l 0
k d i|i==l d=r d|let=i
w p(n,t)=head$rights$p(n#t)
(x:y)#f=m(x!)(a x f):y#a x f
v[]=[];v s=tail(take 6 s):v(drop 6 s)
s(v:t)|'.'>v=[]:s t|(x:u)<-s t=(v:x):u
p(x:y)=(m read$s x,v$m(m(l.read).words)y)
q i=(\(b,h:_)->z(?)(last b)h)$span(any c)i
main=interact$show.((,).w q<*>w(filter i=<<)).p.lines
x!d|h d||h(foldr(z(:))e d)=r$(x*)$sum$lefts=<<d|let=l 0