func_code_string: #include <bits/stdc++.h>   #pragma GCC optimize( Ofast )   #pragma GCC target( sse,sse2,sse3,ssse3,sse4,popcnt,abm,mmx,avx,avx2,fma )   #pragma GCC optimize( unroll-loops )   using namespace std;   long long MOD = 998244353;   double eps = 1e-12;   void solve() {     long long n, k;     cin >> n >> k;     if (n == 1 && k == 10) {       cout <<  -1             <<   n ;       return;     }     if (k == 10) {       cout << 1;       for (int i = 1; i <= n - 1; i++) {         cout << 0;       }     } else {       for (int i = 1; i <= n; i++) {         cout << k;       }     }   }   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     solve();     return 0;   }   