What is probability that: (a)a non leap year has 53 Sundays. (b)a leap year has 53 fridays.

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This one really bowled me over. I don't understand from where I should begin. I actually thought that a non leap year will have 52 weeks and 1 day. But I couldn't think how to find the probability . I think we are more concerned with having 53 Sundays in (a) part. In a non leap year there are 52 weeks and 1 day extra, this means that there are 52 Sunday already and the given condition wants that the 1 day which was extra should also be Sunday ( then there would be 53 Sundays in total). There is only one possible way for this. So favourable outcome becomes one. But I am not clear about total outcomes. Please someone help