#include <bits/stdc++.h>
using namespace std;
namespace mine {
long long qread() {
  long long ans = 0, f = 1;
  char c = getchar();
  while (c < '0' or c > '9') {
    if (c == '-') f = -1;
    c = getchar();
  }
  while ('0' <= c and c <= '9') ans = ans * 10 + c - '0', c = getchar();
  return ans * f;
}
void write(long long num) {
  if (num < 0) putchar('-'), num = -num;
  if (num >= 10) write(num / 10);
  putchar('0' + num % 10);
}
void write1(long long num) {
  write(num);
  putchar(' ');
}
void write2(long long num) {
  write(num);
  putchar('\n');
}
template <typename T>
void chmax(T &x, const T y) {
  x = (x > y ? x : y);
}
template <typename T>
void chmin(T &x, const T y) {
  x = (x < y ? x : y);
}
long long gcd(long long x, long long y) { return y ? gcd(y, x % y) : x; }
const int INF = 0x3f3f3f3f;
const int MOD = 1e9 + 7;
int mm(const int x) { return x >= MOD ? x - MOD : x; }
template <typename T>
void add(T &x, const int &y) {
  x = (x + y >= MOD ? x + y - MOD : x + y);
}
long long qpower(long long x, long long e, int mod = MOD) {
  long long ans = 1;
  while (e) {
    if (e & 1) ans = ans * x % mod;
    x = x * x % mod;
    e >>= 1;
  }
  return ans;
}
long long invm(long long x) { return qpower(x, MOD - 2); }
const int N = 1e6 + 10;
char str[N], wt[N];
vector<pair<int, int> > ans;
int find(int pos, char c) {
  while (str[pos] != c) pos++;
  return pos;
}
void main() {
  int T = qread();
  while (T--) {
    int n = qread(), k = qread();
    scanf("%s", str + 1);
    ans.clear();
    int left = (k - 1) * 2;
    for (int i = (1), I = (n); i <= I; i++) {
      if (i <= (k - 1) * 2)
        wt[i] = (i & 1 ? '(' : ')');
      else
        wt[i] = (i <= left + n / 2 - (k - 1) ? '(' : ')');
    }
    wt[n + 1] = 0;
    for (int i = (1), I = (n); i <= I; i++)
      if (str[i] != wt[i]) {
        int to = find(i, wt[i]);
        reverse(str + i, str + to + 1);
        ans.push_back(make_pair(i, to));
      }
    write2(((int)(ans).size()));
    for (auto t : ans) write1(t.first), write2(t.second);
  }
}
};  // namespace mine
signed main() {
  srand(time(0));
  mine::main();
}
