View difference between Paste ID: 5SatwdGs and 5w4UXyy1

 #include <bits/stdc++.h>
 
 using namespace std;
 using ll = long long;
 using ld = long double;
 
 void fnc(string x, set<string> &a, string alp)
 {
     for (auto cl : alp)
     {
         a.insert(cl + x);
         for (int i = 0; i < x.size(); i++)
         {
             a.insert(x.substr(0, i) + cl + x.substr(i));
         }
         a.insert(x + cl);
     }
 }
 
 int main()
 {
     string alp(26, 'a');
     iota(alp.begin(), alp.end(), 97);
     string x;
     cin >> x;
     set<string> a;
     fnc(x, a, alp);
     return 0;
 }