i havent got any honor for solving this kata!

so where should i make changes in my code?
just add try except ?
or any hints??

im sorry i needed a quick reply
i use python
how do i implement in my code to accept 1000000000??
please help me out

how to input 10^10 into code??
my code is not accepting such huge numbers,
thanks!

ERROR for problem https://www.codewars.com/kata/coordinates-validator/train/python

it passes sample tests but fails at attempt .gives the following Error
some please help me finish the problem

Test Results:
Example Test Cases
should return true for valid coordinates (7 of 7 Assertions)
STDERR:
Traceback:
in
in is_valid_coordinates
ValueError: could not convert string to float: '- 23.4234'

|||| MY CODE |||||||

code:

def is_valid_coordinates(coordinates):

c=coordinates
symb=[',','-','.',' ']
nums='0123456789'
for x in c:
    if x in symb:j=0
    elif x in nums:j=1
    else:return False
s=c.find(',')
x=float(c[:s].strip())
y=float(c[s+1:].strip())
if x<=90 and x>=-90 and y<=180 and y>=-180:
    return True
else:return False