Roman To Integer

Given a string A representing a roman numeral.
Convert A into integer.

A is guaranteed to be within the range from 1 to 3999.

NOTE: Read more
details about roman numerals at Roman Numeric System

Input Format

The only argument given is string A.

Output Format

Return an integer which is the integer verison of roman numeral string.

For Example

Input 1:
    A = "XIV"
Output 1:
    14

Input 2:
    A = "XX"
Output 2:
    20

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.