#
# This program opens a file (the file name is supplied by the user)
# with numbers. Extracts them and stores them in a list.
# It understands lines of numbers separated by space as well as
# number-per-line separation
# e.g.
# 1 21 32 12
# 9 0 -9 23 1
#  OR
# 1
# 21
# 32 ...

def main():
    print("Hello!\
This program opens a file with numbers,\
extracts all the numbers and stores them in a list.\
The file name is supplied by the user.")

    fname = input("Please, input the name of the file with numbers:")
    inSource = open(fname,'r')
 
    
    numbers=[]
    
    for line in inSource: # iterate over lines in the input file

        print("Next line from the file: ", line) # display the line taken from the input file

        # split the string into a list of numbers using " " as a dilimeter, assigns to numbers_in_line
        nums_in_line = line.split()

        for item in nums_in_line: # iterate over items in the line
            numbers.append(int(item))

    print("The numbers extracted from the file {0} are:".format(fname))
    for item in numbers:
        print(item, end=", ")

    inSource.close()

main()