Language: C++

#include<iostream>
suing namespace std;
int main(){
  int a,f,s;
  cin>>a;
  f=a/100;
  s=a%100;
 if((1<=f&&f<=12)&&(s>=1&&s<=12)) cout<<"AMBIGUOUS"<<endl;
  else if(1<=s&&s<=12)　cout<<"YYMM"<<endl;
  else if(1<=f&&f<=12) cout<<"MMYY"<<endl;
  else cout<<"NA"<<endl;
  return 0;
}

Compiler output:
a.cc:9:23: error: extended character 　 is not valid in an identifier
    9 |   else if(1<=s&&s<=12)　cout<<"YYMM"<<endl;
      |                       ^
a.cc:2:1: error: 'suing' does not name a type
    2 | suing namespace std;
      | ^~~~~
a.cc: In function 'int main()':
a.cc:5:3: error: 'cin' was not declared in this scope; did you mean 'std::cin'?
    5 |   cin>>a;
      |   ^~~
      |   std::cin
In file included from a.cc:1:
/usr/include/c++/14/iostream:62:18: note: 'std::cin' declared here
   62 |   extern istream cin;           ///< Linked to standard input
      |                  ^~~
a.cc:8:35: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
    8 |  if((1<=f&&f<=12)&&(s>=1&&s<=12)) cout<<"AMBIGUOUS"<<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:8:54: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    8 |  if((1<=f&&f<=12)&&(s>=1&&s<=12)) cout<<"AMBIGUOUS"<<endl;
      |                                                      ^~~~
      |                                                      std::endl
In file included from /usr/include/c++/14/iostream:41:
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:9:23: error: '\U00003000cout' was not declared in this scope
    9 |   else if(1<=s&&s<=12)　cout<<"YYMM"<<endl;
      |                       ^~~~~~
a.cc:9:39: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
    9 |   else if(1<=s&&s<=12)　cout<<"YYMM"<<endl;
      |                                       ^~~~
      |                                       std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:10:24: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   10 |   else if(1<=f&&f<=12) cout<<"MMYY"<<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:10:38: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   10 |   else if(1<=f&&f<=12) cout<<"MMYY"<<endl;
      |                                      ^~~~
      |                                      std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~
a.cc:11:8: error: 'cout' was not declared in this scope; did you mean 'std::cout'?
   11 |   else cout<<"NA"<<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:11:20: error: 'endl' was not declared in this scope; did you mean 'std::endl'?
   11 |   else cout<<"NA"<<endl;
      |                    ^~~~
      |                    std::endl
/usr/include/c++/14/ostream:744:5: note: 'std::endl' declared here
  744 |     endl(basic_ostream<_CharT, _Traits>& __os)
      |     ^~~~