Find the N-th character
Medium Accuracy: 81.57% Submissions: 6094 Points: 4

Given a binary string S . Perform R iterations on string S, where in each iteration 0 becomes 01 and 1 becomes 10. Find the Nth character (considering 0 based indexing) of the string after performing these R iterations. (See Examples for better understanding)

Example 1:

Input:
S = 101
R = 2
N = 3
Output:
1
Explanation :
After 1st iteration S becomes 100110.
After 2nd iteration, S = 100101101001
Now, we can clearly see that the character
at 3rd index is 1, and so the output.


Example

Input:
S = 11
R = 1
N = 3
Output:
0
Explanation:
After 1st iteration S becomes 1010.
Now, we can clearly see that the character
at 3rd index is 0, and so the output.

You don't need to read input or print anything. Your task is to complete the function nthCharacter() which takes the string S and integers R and N as input parameters and returns the N-th character of the string after performing R operations on S.

Expected Time Complexity: O(r*len(s))
Expected Auxilary Space: O(len(s))

Constraints:
1 ≤ String length ≤ 103
1 ≤ R ≤ 20
0 ≤ N < Length of final string

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