Hi,
I get runtime error with my program. I am almost sure that it is some problem with reading the input. I have tested my program with many examples and always get the right answer.
This is what I use to read the input:

for y,line in enumerate(stdin.read().split()):
        for x,char in enumerate(line.decode('utf8')):
            c=ord(char)
            .......

I had to use decode('utf8') otherwise I got some strange characters. But now the number I get from ord(char) are not the codes given in the problem.

Thanks.