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# Runtime: 41 ms (Top 45.3%) | Memory: 16.25 MB (Top 71.7%)
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class Solution:
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    def numberOfRounds(self, startTime: str, finishTime: str) -> int:
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        hs, ms = (int(x) for x in startTime.split(":"))
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        ts = 60 * hs + ms
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        hf, mf = (int(x) for x in finishTime.split(":"))
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        tf = 60 * hf + mf
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        if 0 <= tf - ts < 15:
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            return 0  # edge case
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        return tf // 15 - (ts + 14) // 15 + (ts > tf) * 96