func_code_string: #include <bits/stdc++.h>   using namespace std;   void Yahia74() {     ios::sync_with_stdio(false), cin.tie(nullptr), cout.tie(nullptr);   }   const int N = 3e5 + 74, OO = 0x3f3f3f3f, MOD = (int)1e9 + 7;   int main() {     Yahia74();     long long n, d;     cin >> n >> d;     long long ans = n, c = 9, t = 10;     while (c <= n) {       long long st = 0, ed = 1e18 / t;       while (st < ed) {         long long m = st + (ed - st + 1) / 2;         if (m * t + c <= n)           st = m;         else           ed = m - 1;       }       if (st * t + c <= n && st * t + c >= n - d) ans = st * t + c;       t *= 10;       c = c * 10 + 9;     }     cout << ans <<   n ;     return 0;   }   