func_code_string: #include <bits/stdc++.h>   using namespace std;   int c(int x) {     int rev = 0;     int tambah = 1;     while (x != 0) {       int temp = x % 10;       if (temp == 4 || temp == 7) {         rev += (tambah * (temp));         tambah *= 10;       }       x /= 10;     }     return rev;   }   int main() {     int a, b;     scanf( %d %d , &a, &b);     a++;     while (c(a) != b) {       a++;     }     printf( %d n , a);     return 0;   }   