[求助] 新人代码求大佬指正Unexpected data declaration statement at

program up
implicit none

!read the file......................................
real :: x(2250),y(2250),z(2250)
integer :: i
open(1,file='XYZ1.txt')
loopi: do i = 1,2250
read(1,*) x(i),y(i),z(i)
end do loopi
close(1)

!........draw a ball and get 4 points..............................................
integer :: a(4)
integer :: j
integer :: n
integer :: k
integer :: l
integer :: m(2250,4)
loopj: do j = 1,2250
k = 0
loopn: do n = 1,2250
if (j == n) then
cycle
end if
if ((x(n)-x(j))**2+(y(n)-y(j))**2+(z(n)-z(j))**2 < 1.8**2) then
k = k + 1
a(k) = n
if (k == 4) then
loopl: do l = 1,4
m(j,l) = a(l)
print *,m(j,l)
end do loopl
end if
end if
end do loopn
end do loopj
end program up

program up
  implicit none
  Integer , parameter :: N = 2250 , S = 4
  real :: x(N),y(N),z(N)
  integer :: i , j , k , l
  integer :: a(S)
  integer :: m(N,S)
  !read the file......................................
  open(1,file='XYZ1.txt')
  do i = 1,N
    read(1,*) x(i),y(i),z(i)
  end do
  close(1)
  !........draw a ball and get 4 points..............................................
  do j = 1,N
    k = 0
    do i = 1,N
      if (j == i) cycle
      if ((x(i)-x(j))**2+(y(i)-y(j))**2+(z(i)-z(j))**2 < 1.8**2) then
        k = k + 1
        a(k) = i
        if (k == 4) then
          do l = 1,S
            m(j,l) = a(l)
            print *,m(j,l)
          end do
        end if
      end if
    end do
  end do
end program up