You like playing chess tournaments online.

In your last tournament you played n games. For the sake of this problem, each chess game is either won or lost (no draws). When you lose a game you get 0 points. When you win you get 1 or 2 points: if you have won also the previous game you get 2 points, otherwise you get 1 point. If you win the very first game of the tournament you get 1 point (since there is not a "previous game").

The outcomes of the n games are represented by a string s of length n: the i-th character of s is W if you have won the i-th game, while it is L if you have lost the i-th game.

After the tournament, you notice a bug on the website that allows you to change the outcome of at most k of your games (meaning that at most k times you can change some symbol L to W, or W to L). Since your only goal is to improve your chess rating, you decide to cheat and use the bug.

Compute the maximum score you can get by cheating in the optimal way.

Input

Each test contains multiple test cases. The first line contains an integer t (1≤ t ≤ 20,000) — the number of test cases. The description of the test cases follows.

The first line of each testcase contains two integers n, k (1≤ n≤ 100,000, 0≤ k≤ n) – the number of games played and the number of outcomes that you can change.

The second line contains a string s of length n containing only the characters W and L. If you have won the i-th game then s_i= W, if you have lost the i-th game then s_i= L.

It is guaranteed that the sum of n over all testcases does not exceed 200,000.

Output

For each testcase, print a single integer – the maximum score you can get by cheating in the optimal way.

Example

Input


8
5 2
WLWLL
6 5
LLLWWL
7 1
LWLWLWL
15 5
WWWLLLWWWLLLWWW
40 7
LLWLWLWWWLWLLWLWWWLWLLWLLWLLLLWLLWWWLWWL
1 0
L
1 1
L
6 1
WLLWLW


Output


7
11
6
26
46
0
1
6

Note

Explanation of the first testcase. Before changing any outcome, the score is 2. Indeed, you won the first game, so you got 1 point, and you won also the third, so you got another 1 point (and not 2 because you lost the second game).

An optimal way to cheat is to change the outcomes of the second and fourth game. Doing so, you end up winning the first four games (the string of the outcomes becomes WWWWL). Hence, the new score is 7=1+2+2+2: 1 point for the first game and 2 points for the second, third and fourth game.

Explanation of the second testcase. Before changing any outcome, the score is 3. Indeed, you won the fourth game, so you got 1 point, and you won also the fifth game, so you got 2 more points (since you won also the previous game).

An optimal way to cheat is to change the outcomes of the first, second, third and sixth game. Doing so, you end up winning all games (the string of the outcomes becomes WWWWWW). Hence, the new score is 11 = 1+2+2+2+2+2: 1 point for the first game and 2 points for all the other games.


import java.io.IOException;
import java.io.InputStream;
import java.lang.reflect.Array;
import java.util.*;

public class TestClass {


    static final class InputReader {
        private final InputStream stream;
        private final byte[] buf = new byte[1024];
        private int curChar;
        private int numChars;

        public InputReader(InputStream stream) {
            this.stream = stream;
        }

        private int read() throws IOException {
            if (curChar >= numChars) {
                curChar = 0;
                numChars = stream.read(buf);
                if (numChars <= 0) {
                    return -1;
                }
            }
            return buf[curChar++];
        }

        public final int readInt() throws IOException {
            return (int) readLong();
        }

        public final long readLong() throws IOException {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
                if (c == -1) throw new IOException();
            }
            boolean negative = false;
            if (c == '-') {
                negative = true;
                c = read();
            }
            long res = 0;
            do {
                res *= 10;
                res += c - '0';
                c = read();
            } while (!isSpaceChar(c));
            return negative ? -res : res;
        }

        public final int[] readIntArray(int size) throws IOException {
            int[] array = new int[size];
            for (int i = 0; i < size; i++) {
                array[i] = readInt();
            }
            return array;
        }

        public final long[] readLongArray(int size) throws IOException {
            long[] array = new long[size];
            for (int i = 0; i < size; i++) {
                array[i] = readLong();
            }
            return array;
        }

        public final String readString() throws IOException {
            int c = read();
            while (isSpaceChar(c)) {
                c = read();
            }
            StringBuilder res = new StringBuilder();
            do {
                res.append((char) c);
                c = read();
            } while (!isSpaceChar(c));
            return res.toString();
        }

        private boolean isSpaceChar(int c) {
            return c == ' ' || c == '\n' || c == '\r' || c == '\t' || c == -1;
        }
    }

    static long mulmod(long a, long b,
                       long mod) {
        long res = 0; // Initialize result
        a = a % mod;
        while (b > 0) {
            // If b is odd, add 'a' to result
            if (b % 2 == 1) {
                res = (res + a) % mod;
            }

            // Multiply 'a' with 2
            a = (a * 2) % mod;

            // Divide b by 2
            b /= 2;
        }

        // Return result
        return res % mod;
    }

    static long pow(long a, long b, long MOD) {
        long x = 1, y = a;
        while (b > 0) {
            if (b % 2 == 1) {
                x = (x * y);
                if (x > MOD) x %= MOD;
            }
            y = (y * y);
            if (y > MOD) y %= MOD;
            b /= 2;
        }
        return x;
    }

    static long[] f = new long[100001];

    static long InverseEuler(long n, long MOD) {
        return pow(n, MOD - 2, MOD);
    }

    static long C(int n, int r, long MOD) {

        return (f[n] * ((InverseEuler(f[r], MOD) * InverseEuler(f[n - r], MOD)) % MOD)) % MOD;
    }


    static int[] h = {0, 0, -1, 1};
    static int[] v = {1, -1, 0, 0};


    public static class Pair {
        public long a, b;
        public long pos, bb;

        public Pair(long a, long b, long pos, long bb) {
            this.a = a;
            this.b = b;
            this.pos = pos;
            this.bb = bb;
        }
    }

    static class Pair2 {
        public long cost;
        int node;

        public Pair2(long cos, int node) {
            this.cost = cos;
            this.node = node;
        }
    }

    static long compute_hash(String s) {
        int p = 31;
        int m = 1000000007;
        long hash_value = 0;
        long p_pow = 1;
        for (int i = 0; i < s.length(); ++i) {
            char c = s.charAt(i);
            hash_value = (hash_value + (c - 'a' + 1) * p_pow) % m;
            p_pow = (p_pow * p) % m;
        }
        return hash_value;
    }

    public static class SegmentTree {
        long[][] tree;
        int n;

        public SegmentTree(int[] nodes) {
            tree = new long[nodes.length * 4][2];
            n = nodes.length;
            build(0, n - 1, 0, nodes);

        }

        private void build(int l, int r, int pos, int[] nodes) {
            if (l == r) {
                tree[pos][0] = nodes[l];
                tree[pos][1] = l;
                return;
            }
            int mid = (l + r) / 2;
            build(l, mid, 2 * pos + 1, nodes);
            build(mid + 1, r, 2 * pos + 2, nodes);
            if (tree[2 * pos + 1][0] > tree[2 * pos + 2][0]) {
                tree[pos][1] = tree[2 * pos + 1][1];
            } else {
                tree[pos][1] = tree[2 * pos + 2][1];
            }
            tree[pos][0] = Math.max(tree[2 * pos + 1][0], tree[2 * pos + 2][0]);
        }

//        public void update(int pos, int val) {
//            updateUtil(0, n - 1, 0, pos, val);
//        }

        public long[] get(int l, int r) {
            return getUtil(0, n - 1, 0, l, r);
        }

        private long[] getUtil(int l, int r, int pos, int ql, int qr) {
            if (ql > r || qr < l) {
                return new long[]{-1, -1};
            }
            if (l >= ql && r <= qr) {
                return tree[pos];
            }

            int mid = (l + r) / 2;
            long[] left = getUtil(l, mid, 2 * pos + 1, ql, qr);
            long[] right = getUtil(mid + 1, r, 2 * pos + 2, ql, qr);
            long choice = right[1];
            if (left[0] > right[0]) choice = left[1];
            return new long[]{Math.max(left[0], right[0]), choice};

        }

//        private void updateUtil(int l, int r, int pos, int i, int val) {
//            if (i < l || i > r) {
//                return;
//            }
//            if (l == r) {
//                tree[pos] = val;
//                return;
//            }
//            int mid = (l + r) / 2;
//            updateUtil(l, mid, 2 * pos + 1, i, val);
//            updateUtil(mid + 1, r, 2 * pos + 2, i, val);
//            tree[pos] = tree[2 * pos + 1] + tree[2 * pos + 2];
//        }
    }

    static int counter = 0;
    static int[] rIn;
    static int[] rOut;
    static int[] lIn;
    static int[] lOut;
    private static int[] flatten;
    private static int[] lFlatten;
    static long answer = 0;

    static int VISITED = 1;
    static int VISITING = 2;

    public static void main(String[] args) throws Exception {
        //https://i...content-available-to-author-only...e.com/ebRGa6
        InputReader in = new InputReader(System.in);


        int t = in.readInt();
        while (t-- > 0) {

            int n = in.readInt();
            int k = in.readInt();

            String g = in.readString();
            int forw = 0;
            int ans = 0;
            int i = 0;
            for (; i < n; ++i) {

                if (g.charAt(i) == 'W') {
                    if (i > 0 &&  g.charAt(i-1) == 'W') {
                        ans+=2;
                    } else {
                        ans+=1;
                    }
                }
            }
            i=0;
            for (; i < n; ++i) {

                if (g.charAt(i) == 'W') {
                    break;
                }
            }
            if (i == n) {
                if (k != 0)
                System.out.println(Math.min(k, n)*2 - 1);
                else

                    System.out.println(0);
                continue;
            }
            int j = n-1;
            for (; j >= 0; --j) {

                if (g.charAt(j) == 'W') {
                    break;
                }
            }

            // LLLWLLL
            // 0123456
            // 3

            int front = i + n - j - 1;
            PriorityQueue<Integer> q = new PriorityQueue<>();
            for (; i <= j;) {
                if (g.charAt(i) == 'L') {
                    int len = 0;
                    while (i < n && g.charAt(i) == 'L') {
                        len++;
                        i++;
                    }
                    q.add(len);
                } else i++;
            }

            while (k > 0 && q.size() != 0) {
                Integer ls = q.remove();
                if (ls > k) {
                    ans += k * 2;
                    k = 0;
                } else {
                    ans += ls * 2;
                    ans += 1;
                    k -= ls;
                }
            }

            if (k > 0) {
                ans += Math.min(k, front) * 2;
            }


            System.out.println(ans);


        }

    }

    private static int solver(int[] nums, int pos, int[] dp) {
        if (pos >= nums.length) return 0;
        if (dp[pos] != Integer.MAX_VALUE) return dp[pos];
        int min = solver(nums, pos + 2, dp) + nums[pos];
        min = Math.min(solver(nums, pos + 3, dp) + nums[pos], min);
        if (pos + 1 < nums.length) min = Math.min(min, nums[pos] + nums[pos + 1] + solver(nums, pos + 3, dp));
        if (pos + 1 < nums.length) min = Math.min(min, nums[pos] + nums[pos + 1] + solver(nums, pos + 4, dp));

//        System.out.println(pos + " " + min);
        return dp[pos] = min;
    }


    static int countFreq(String pattern, String text) {
        int m = pattern.length();
        int n = text.length();
        int res = 0;

        for (int i = 0; i <= n - m; i++) {
            int j;
            for (j = 0; j < m; j++) {
                if (text.charAt(i + j) != pattern.charAt(j)) {
                    break;
                }
            }
            if (j == m) {
                res++;
                j = 0;
            }
        }
        return res;
    }

    private static int solve(int n, int[] dp, int cn) {
        if (cn > n) return 0;
        if (cn == n) return 1;
        if (dp[cn] != -1) return dp[cn];
        int ans = 0;
        for (int i = 2; i <= 9; ++i) {
            ans += solve(n, dp, cn * i);
        }
        return dp[cn] = ans;
    }


    private static void dfsR(List<List<Integer>> g, int node, int[] v) {
        rIn[node] = counter;
        flatten[counter++] = v[node];

        for (int i = 0; i < g.get(node).size(); ++i) {
            dfsR(g, g.get(node).get(i), v);
        }

        rOut[node] = counter;
        flatten[counter++] = v[node] * -1;
    }

    private static void dfsL(List<List<Integer>> g, int node, int[] v) {
        lIn[node] = counter;
        lFlatten[counter++] = v[node];

        for (int i = 0; i < g.get(node).size(); ++i) {
            dfsL(g, g.get(node).get(i), v);
        }

        lOut[node] = counter;
        lFlatten[counter++] = v[node] * -1;

        TreeMap<String, Integer> map = new TreeMap<>();
    }


    private static void preprocess(int pos, int[][] pre, List<List<Integer>> tree, int[] traverse, int depth, int last, int[] tin, int[] tout) {
        tin[pos] = counter++;
        traverse[depth] = pos;

        for (int i = 0; depth - (1 << i) >= 0; ++i) {
            pre[pos][i] = traverse[depth - (1 << i)];
        }

        for (int i = 0; i < tree.get(pos).size(); ++i) {
            if (tree.get(pos).get(i) != last)
                preprocess(tree.get(pos).get(i), pre, tree, traverse, depth + 1, pos, tin, tout);
        }
        tout[pos] = counter++;
    }

    static int gcd(int a, int b) {

        while (b != 0) {
            int t = a;
            a = b;
            b = t % b;
        }
        return a;
    }


    static boolean submit = true;

    static void debug(String s) {
        if (!submit)
            System.out.println(s);
    }

    static void debug(int s) {

        Stack<Integer> st = new Stack<>();
        if (!submit)
            System.out.println(s);


        /*

        4 2 3 _ 2 4 3 _
         */
    }


}

































