Given an N bit binary number, find the 1's complement of the number. The ones' complement of a binary number is defined as the value obtained by inverting all the bits in the binary representation of the number (swapping 0s for 1s and vice versa).

Example 1:
Input:
N = 3
S = 101
Output:
010
Explanation:
We get the output by converting 1's in S
to 0 and 0s to 1
Example 2:
Input:
N = 2
S = 10
Output:
01
Explanation:
We get the output by converting 1's in S
to 0 and 0s to 1
Your Task:
You don't need to read input or print anything. Your task is to complete the function onesComplement() which takes the binary string S, its size N as input parameters and returns 1's complement of S of size N.

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

Constraints:
1<=N<=100

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