[Link] https://codeforces.com/contest/1634/problem/A
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import java.util.*;
import java.io.*;
public class Main {
static BufferedReader br;
static StringBuilder sb = new StringBuilder();
public static void main(String[] args) throws IOException {
br = new BufferedReader(new InputStreamReader(System.in));
int t = toi(br.readLine());
int[] arr;
ArrayList<Integer> al = new ArrayList<>();
for(int iter = 0; iter < t; iter++) {
arr = getArr();
int n = arr[0], k = arr[1];
String s = br.readLine();
if(isPalindrome(s) || k == 0) {
sb.append("1\n");
} else {
sb.append("2\n");
}
}
print(sb);
}
static boolean isPalindrome(String s) {
int l = 0, r = s.length() - 1;
while(l < r) {
if(s.charAt(l) != s.charAt(r)) return false;
l++;
r--;
}
return true;
}
static int toi(String s) { return Integer.parseInt(s); }
static long tol(String s) { return Long.parseLong(s); }
static String[] getLine() throws IOException { return br.readLine().split(" "); }
static int[] getArr() throws IOException { return Arrays.stream(br.readLine().split(" ")).mapToInt(Integer::parseInt).toArray(); }
static <T> void print(T s) { System.out.print(s); }
static <T> void println(T s) { System.out.println(s); }
}