func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     ios_base::sync_with_stdio(false);     cin.tie(NULL);     cout.tie(NULL);     long long n, k;     cin >> n >> k;     string s;     cin >> s;     string ans;     for (long long i = 0; i < k; i++) {       ans.push_back(s[i]);     }     for (long long i = k; i < n; i++) {       ans.push_back(ans[i - k]);     }     cout << n << endl;     if (ans >= s) {       cout << ans << endl;     } else {       long long i = k - 1;       while (i >= 0 && ans[i] ==  9 ) {         ans[i] =  0 ;         for (long long j = i; j < n; j += k) {           ans[j] =  0 ;         }         i--;       }       for (; i < n; i += k) {         ans[i]++;       }       cout << ans << endl;     }   }   