Problem F
Genetics
For villains that intend to take over the world, a common way to avoid getting caught is to clone themselves. You have managed to catch an evil villain and her $N1$ clones, and you are now trying to figure out which one of them is the real villain.
To your aid you have each person’s DNA sequence, consisting of $M$ characters, each being either A, C, G or T. You also know that the clones are not perfectly made; rather, their sequences differ in exactly $K$ places compared to the real villain’s.
Can you identify the real villain?
Input
The first line contains the three integers $N$, $M$, and $K$, where $1 \le K \le M$. The following $N$ lines represent the DNA sequences. Each of these lines consists of $M$ characters, each of which is either A, C, G or T.
In the input, there is exactly one sequence that differs from all the other sequences in exactly $K$ places.
Warning: this problem has rather large amounts of input, and will require fast IO in Java.
Output
Output an integer – the index of the DNA sequence that belongs to the villain. The sequences are numbered starting from $1$.
Constraints
Your solution will be tested on a set of test groups, each worth a number of points. Each test group contains a set of test cases. To get the points for a test group you need to solve all test cases in the test group. Your final score will be the maximum score of a single submission.
Group 
Points 
Limits 
Additional Constraints 
1 
27 
$3 \le N, M \le 100$ 

2 
19 
$3 \le N, M \le 1800$ 
All characters are either A or C. 
3 
28 
$3 \le N, M \le 4100$ 
All characters are either A or C. 
4 
26 
$3 \le N, M \le 4100$ 
Sample Input 1  Sample Output 1 

4 3 1 ACC CCA ACA AAA 
3 
Sample Input 2  Sample Output 2 

4 4 3 CATT CAAA ATGA TCTA 
4 