<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def dollar_signs(value, failure_string='N/A'):
 """ Converts an integer into the corresponding number of dollar sign symbols. If the submitted value isn't a string, returns the `failure_string` keyword argument. Meant to emulate the illustration of price range on Yelp. """

    try:
        count = int(value)
    except ValueError:
        return failure_string
    string = ''
    for i in range(0, count):
        string += '$'
    return string