Jumbled Strings
Medium Accuracy: 25.0% Submissions: 4 Points: 4

You are provided an input string S and the string “GEEKS” . Find the number of ways in which the subsequence “GEEKS” can be formed from the string S.
 

Example 1:

Input : S = "GEEKS"
Output: 1
Explanation: 
"GEEKS" occurs in S only once.


Example 2:

Input: S = "AGEEKKSB"
Output: 2
Explanation: Subsequenece "GEEKS" occurs in 
S two times. First one is taking the first 
'K' into consideration and second one is 
taking second 'K'.

 

Your Task:
You don't need to read or print anything. Your task is to complete the function TotalWays() which takes string S as input paramater and returns total ways modulo 109 + 7.
 

Expected Time Complexity : O(N * K) where N is length of string and K is constant.
Expected Space Complexity: O(N * K)

 

Constraints: 
1 <= Length od string <= 10000 

 

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