我们在AtCoder镇有连续三天的天气记录。长度为3的字符串S表示三天的天气记录-如果第i个字符为“S”，则表示当天阳光明媚
-第i天；如果该字符为“R”，则表示那天下雨。
找出此期间连续雨天的最大数量。例如：RRS，则连续下雨天数的最大数量是2.
Time Limit: 2 sec / Memory Limit: 1024 MB
Problem Statement
We have weather records at AtCoder Town for some consecutive three days. A string of length 33, SS, represents the records - if the i-th character is 'S', it means it was sunny on the ii-th day; if that character is 'R', it means it was rainy on that day.
Find the maximum number of consecutive rainy days in this period.
Constraints
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|S|=3
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Each character of S is 'S' or 'R'.