Create Rightmost Char

RIGHTMOST CHAR
CHALLENGE DESCRIPTION:

You are given a string 'S' and a character 't'. Print out the position of the rightmost occurrence of 't' (case matters) in 'S' or -1 if there is none. The position to be printed out is zero based.

INPUT SAMPLE:

The first argument will ba a path to a filename, containing a string and a character, comma delimited, one per line. Ignore all empty lines in the input file. E.g. 
Hello World,r
Hello CodeEval,E
OUTPUT SAMPLE:

Print out the zero based position of the character 't' in string 'S', one per line. Do NOT print out empty lines between your output. 
E.g.

8
10
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