func_code_string: #include <bits/stdc++.h>   using namespace std;   string A, B;   int has[10];   string res;   void Create(int from) {     for (int i = 0; i < 10; i++) {       for (int j = 0; j < has[i]; j++) {         res[from++] = i +  0 ;       }     }   }   int main() {     cin >> A >> B;     int st = 0;     for (int i = 0; i < A.length(); i++) has[A[i] -  0 ]++;     while (A.length() < B.length()) {       A =  0  + A;       st++;     }     res = A;     for (int i = st; i < A.length(); i++) {       for (int j = 10 - 1; j >= 0; j--) {         if (has[j] > 0) {           has[j]--;           res[i] = j +  0 ;           Create(i + 1);           if (res <= B) break;           has[j]++;         }       }     }     int pos = 0;     while (res[pos] ==  0 ) pos++;     cout << res.substr(pos) << endl;     return 0;   }   