func_code_string: #include <bits/stdc++.h>   using namespace std;   int n;   string s;   int l = 0, u = 0, d = 0;   int main() {     cin >> n;     for (int i = 0; i < n; i++) {       int l = -1, u = -1, d = -1;       cin >> s;       for (int j = 0; j < s.length(); j++) {         if (isdigit(s[j])) d = j;         if (islower(s[j])) l = j;         if (isupper(s[j])) u = j;       }       if (d == -1)         for (int j = 0; j < s.length(); j++)           if (j != l && j != u) {             s[j] =  4 ;             d = j;             break;           }       if (l == -1)         for (int j = 0; j < s.length(); j++)           if (j != d && j != u) {             s[j] =  a ;             l = j;             break;           }       if (u == -1)         for (int j = 0; j < s.length(); j++)           if (j != l && j != d) {             s[j] =  A ;             u = j;             break;           }       cout << s << endl;     }     return 0;   }   