func_code_string: #include <bits/stdc++.h>   #pragma comment(linker,  /STACK:1024000000,1024000000 )   using namespace std;   int const maxn = 3000005;   string st[maxn];   int ab[200], ac[200], ad[200];   char b[maxn], c[maxn], d[maxn];   int main() {     cin >> b >> c;     int lenc = strlen(c);     for (int i = 0; i < lenc; i++) {       ac[c[i] -  a ]++;     }     int tw = 0, t = 0;     int lenb = strlen(b);     for (int i = 0; i < lenb; i++) {       if (b[i] ==  ? )         tw++;       else         ab[b[i] -  a ]++;     }     while (tw > 0) {       for (int i = 0; i < 26; i++) {         if (tw == 0) break;         if (ab[i] >= ac[i]) {           ab[i] -= ac[i];         } else {           if (tw >= ac[i] - ab[i]) {             tw -= ac[i] - ab[i];             ad[i] += ac[i] - ab[i];             ab[i] = 0;           } else {             ad[0] += tw;             tw = 0;           }         }       }     }     for (int i = 0; i < 26; i++) {       for (int j = 0; j < ad[i]; j++) {         d[t++] = (char)(i +  a );       }     }     t = 0;     for (int i = 0; i < lenb; i++) {       if (b[i] ==  ? ) {         cout << d[t++];       } else         cout << b[i];     }     cout << endl;     return 0;   }   