Reading data file in Fortran with known number of lines but unknown number of entries in each line

Question

How can I read the data file containing known number of lines but the number of entries in each line is unknown, e.g. if my data file contain some thing like

Answer 1

integer,parameter :: reclen=99999        ! maximum record length
integer,parameter :: undef=-9999         ! undefined value
integer :: actual_reclen                 ! actual record length
integer,dimension(reclen) :: dummy=undef ! dummy array used for reading
integer,dimension(:),allocatable :: a    ! final array

open(unit=10,file='sample.txt',form='formatted',access='sequential')
read(unit=10,fmt=*,end=101)(dummy(i),i=1,reclen)
101 close(unit=10)

actual_reclen=COUNT(dummy/=undef)
allocate(a(actual_reclen))
a=dummy(1:actual_reclen)

end