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Count A+b+c+ Subsequences

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1. You are given a string str.
2. You are required to calculate and print the count of subsequences of the nature a+b+c+.
For abbc -> there are 3 subsequences. abc, abc, abbc
For abcabc -> there are 7 subsequences. abc, abc, abbc, aabc, abcc, abc, abc.
Input Format 
A string str
Output Format 
count of subsequences of the nature a+b+c+
Question Video
Constraints 
0 < str.length <= 10
Sample Input 
abcabc
Sample Output 
7


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