problem: given a line, pick out the numbers (sequence of digits like 24 or 459)

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read in line

go down line, looking for a digit
	-- if found, save it and continue saving until first non-digit (or end)
	-- print it
repeat until end of line

============================

read in line

get length of line -- call it L

for each character in line -- start at 0, go to L-1 inclusive
	-- if it's not a digit, go back to for
	-- save character somewhere
		repeat while it's a digit
			-- look at next character
			-- if digit, append to previously saved character
	-- if not, print saved characters

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hel32lo5^

32  print it

5 print it


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line = input("> ")

L = len(line)

for i in range(L):
	if not line[i].isdigit():
		continue
	digitstring = line[i]
	i = i+1
	while line[i].isdigit():
		digitstring = digitstring + line[i]
		i = i + 1
	print(digitstring)

============================

read in line

get length of line -- call it L

indigits = FALSE



for each character in line -- start at 0, go to L-1 inclusive
	-- if it's not a digit and indigits is FALSE:
		go back to for
	-- if it's not a digit and indigits is TRUE:
		print string of digits
		clear string of digits
		go back to for
	-- indigits = TRUE
	-- stick character on end of digitstring

if the last thing you looked at was  digit
	print digitstring

============================

line = input("> ")

L = len(line)

indigits = False

digitstring = ""

for i in range(L):
	if not line[i].isdigit() and not indigits:
		continue
	if not line[i].isdigit() and indigits:
		indigits = False
		print(digitstring)
		digitstring = ""
		continue
	indigits = True
	digitstring = digitstring + line[i]

if indigits:
	print(digitstring)

========================


hel34lo5^

L = 9
indigits = False  True  True False True False
digitstring = ""

i = 0 1 2 3  4  5

print: 
34

==================

8

L = 1
indigits = False True
digitstring = "8"

i = 0