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+
Constraints
0 < str.length <= 10
Notice
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Input
abcabc
Output
7