program W
implicit none
character(14)::S
integer::cnt=0,ans=0
integer::i
read*,S(1:7)
read*,S(8:14)
do i=1,14
    if(S(i:i)=="o")then
        cnt=cnt+1
        ans=max(cnt,ans)
    else
        cnt=0
    endif
end do
print"(i0)",ans
end program W