#include <bits/stdc++.h>   using namespace std;   bool ask(long long l, long long r) {     cout << l <<     << r <<   n ;     cout.flush();     string res;     cin >> res;     return res ==  Yes ;   }   int main() {     srand(time(NULL));     ios_base::sync_with_stdio(false);     long long n, k;     cin >> n >> k;     long long l = 1, r = n;     while (true) {       if (r - l > 60ll) {         long long mid = l + r >> 1;         if (ask(l, mid)) {           l = max(1ll, l - k);           r = min(mid + k, n);         } else {           l = max(mid + 1 - k, 1ll);           r = min(r + k, n);         }       } else {         long long mid = rand() % (r - l + 1) + l;         if (ask(mid, mid)) return 0;         l = max(l - k, 1ll);         r = min(r + k, n);       }     }   }   