func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false), cin.tie(NULL);     long long k = 0;     cin >> k;     if (k == 1) {       cout <<  4 ;       return 0;     }     string s =   ;     unsigned long long a = 1000000000000000000;     unsigned long long num = 0;     long long f = 0;     while (k > 0) {       if (k >= 2) {         k -= 2;         s += to_string(8);         num = (num * 10) + 8;       } else {         k -= 1;         s += to_string(0);         num = (num * 10) + 0;       }       if (num > a) {         f = 1;         break;       }     }     if (f == 0)       cout << s;     else       cout <<  -1 ;     return 0;   }   