func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     long long i, j, k, n;     string s, s1, b;     cin >> n >> k >> s;     b = s;     for (i = k; i < n; i++) b[i] = b[i - k];     if (b >= s)       cout << n << endl << b << endl;     else {       for (i = k - 1; i >= 0; i--) {         if (b[i] ==  9 )           b[i] =  0 ;         else {           b[i]++;           break;         }       }       for (i = k; i < n; i++) b[i] = b[i - k];       cout << n << endl << b << endl;     }   }   