203-strings-and-arrows

Strings and arrows

Challenge Description:

You have a string composed of the following symbols: '>', '<', and '-'. Your task is to find, count, and print to the output a number of arrows in the string. An arrow is a set of the following symbols: '>>-->' or '<--<<'.
Note that one character may belong to two arrows at the same time. Such example is shown in the line #1.

Input sample:

The first argument is a path to a file. Each line includes a test case with a string of different length from 10 to 250 characters. The string consists of '>', '<', and '-' symbols.

For example:

<--<<--<<
<<>>--><--<<--<<>>>--><
<-->>

Output sample:

Print the total number of found arrows for each test case.

For example:

2
4
0

Constraints:

1. An arrow is a set of the following symbols: '>>-->' or '<--<<'.
2. One symbol may belong to two arrows at the same time.
3. The number of test cases is 40.