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# Maximum Substring

Problem Description

Given a string A consisting of only characters 'a' and 'b'.
Divide the string into substrings of length B.
Find the subtring with maximum count of 'a' and return the count.

Note: If the length of the string is not a multiple of B and there are some characters left in the end consider them also as a substring.

Problem Constraints
1 <= |A| <= 105
Ai = {'a', 'b'}
1 <= B <= 105

Input Format
First argument A is a string.
Second argument is an integer B.

Output Format
Return an integer.

Example Input
Input 1:
```A = "baab"
B = 2
```

Input 2:

```A = "bba"
B = 2
```

Example Output
Output 1:
```1
```

Output 2:

```1
```

Example Explanation
Explanation 1:
```The subtrings are "ba" and "ab".
Both have count of 'a' equal to 1.```

Explanation 2:

```The substrings are "bb" and "a".
"a" has the highest count which is 1.```

NOTE: You only need to implement the given function. Do not read input, instead use the arguments to the function. Do not print the output, instead return values as specified. Still have a question? Checkout Sample Codes for more details.
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