131-split-the-number

Split The Number

Challenge Description:

You are given a number N and a pattern. The pattern consists of lowercase latin letters and one operation "+" or "-". The challenge is to split the number and evaluate it according to this pattern e.g.
1232 ab+cd -> a:1, b:2, c:3, d:2 -> 12+32 -> 44

Input sample:

Your program should accept as its first argument a path to a filename. Each line of the file is a test case, containing the number and the pattern separated by a single whitespace. E.g.

3413289830 a-bcdefghij
776 a+bc
12345 a+bcde
1232 ab+cd
90602 a+bcde

Output sample:

For each test case print out the result of pattern evaluation. E.g.

-413289827
83
2346
44
611

Constraints:
N is in range [100, 1000000000]