Language: C++

#include <bits/stdc++.h>
using namespase std;
int main(){
  string s;
  cin >> s >> endl;
  if(s.at(0)==s.at(1)){
    if(s.at(2)==s.at(3)||s.at(0)!=s.at(2)){
      cout << "Yes" << endl;
    }else{
      cout << "No" << endl;
    }
  }else if(s.at(0)==s.at(2)){
    if(s.at(1)==s.at(3)||s.at(0)!=s.at(1)){
      cout << "Yes" << endl;
    }else{
      cout << "No" << endl;
    }
  }else if(s.at(0)==s.at(3)){
    if(s.at(1)==s.at(2)||s.at(0)!=s.at(1)){
      cout << "Yes" << endl;
    }else{
      cout << "No" << endl;
    }
  }else{
    cout << "No" << endl;
  }
}

Compiler output:
a.cc:2:7: error: expected nested-name-specifier before 'namespase'
    2 | using namespase std;
      |       ^~~~~~~~~
a.cc: In function 'int main()':
a.cc:4:3: error: 'string' was not declared in this scope
    4 |   string s;
      |   ^~~~~~
a.cc:4:3: note: suggested alternatives:
In file included from /usr/include/c++/14/string:41,
                 from /usr/include/c++/14/bitset:52,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:52,
                 from a.cc:1:
/usr/include/c++/14/bits/stringfwd.h:77:33: note:   'std::string'
   77 |   typedef basic_string<char>    string;
      |                                 ^~~~~~
/usr/include/c++/14/string:76:11: note:   'std::pmr::string'
   76 |     using string    = basic_string<char>;
      |           ^~~~~~
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin >> s >> endl;
      |   ^~~
      |   std::cin
In file included from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:146:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:5:10: error: 's' was not declared in this scope
    5 |   cin >> s >> endl;
      |          ^
a.cc:5:15: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    5 |   cin >> s >> endl;
      |               ^~~~
      |               std::endl
In file included from /usr/include/c++/14/istream:41,
                 from /usr/include/c++/14/sstream:40,
                 from /usr/include/c++/14/complex:45,
                 from /usr/include/c++/14/ccomplex:39,
                 from /usr/include/x86_64-linux-gnu/c++/14/bits/stdc++.h:127:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:8:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |       cout << "Yes" << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:10:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |       cout << "No" << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:14:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   14 |       cout << "Yes" << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:16:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   16 |       cout << "No" << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:20:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   20 |       cout << "Yes" << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:22:7: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   22 |       cout << "No" << endl;
      |       ^~~~
      |       std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~
a.cc:25:5: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   25 |     cout << "No" << endl;
      |     ^~~~
      |     std::cout
/usr/include/c++/14/iostream:63:18: note: 'std::cout' declared here
   63 |   extern ostream cout;          ///< Linked to standard output
      |                  ^~~~