Given a string S, check if it is possible to convert it into a string that is repetition of substring with K characters. To convert, we can replace one substring of length K with K characters.

Example 1:

Input:
N = 4, K = 2, S = "bdac"
Output: 1
Explanation: We can replace either
"bd" with "ac" or "ac" with "bd"

​Example 2:

Input: 
N = 5, K = 2, S = "abcde"
Output: 0
Explanation: Since N % K != 0, it's not 
possible to convert S into a string which
is a concatanation of a substring with 
length K.

Your Task:
You don't need to read input or print anything. Your task is to complete the function kSubstrConcat() which takes a string S, its length N and an integer K as inputs and return 1/0 accordingly.

Expected Time Complexity: O(N).
Expected Auxiliary Space: O(N).

Constraints:
2 <= K < N <= 100000