Count ROR

Gary is given a string containing only ‘R’s and ‘O’s (uppercase). Gary wants to count the total number of subsequences forming “ROR” in the given string. You need to return the count of subsequences possible.

Input Format: String (that contains R & O only)

Sample Input 1:
OROR
Sample Output 1:
1
Sample Input 2:
RRORR
Sample Output 2:
4

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