Language: C++

#include <bits/stdc++.h>
using namespace std;

int main()
{
	string a;
	int pos=0;
	cin>>a;
	a=a+"D";
	while(1)
	{
		pos=a.find(pos,"A");
		if(pos<0)
		{
			cout<<"NO"<<endl;
			break;
		}
		if(a[pos+1]=="C")
		{
			cout<<"YES"<<endl;
			break;
		}
		pos++;
	}
	return 0;
}

Compiler output:
a.cc: In function 'int main()':
a.cc:12:27: error: no matching function for call to 'std::__cxx11::basic_string<char>::find(int&, const char [2])'
   12 |                 pos=a.find(pos,"A");
      |                     ~~~~~~^~~~~~~~~
In file included from /usr/include/c++/14/string:54,
                 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/basic_string.h:2740:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _CharT*, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (near match)
 2740 |       find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:2740:7: note:   conversion of argument 2 would be ill-formed:
a.cc:12:32: error: invalid conversion from 'const char*' to 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-fpermissive]
   12 |                 pos=a.find(pos,"A");
      |                                ^~~
      |                                |
      |                                const char*
/usr/include/c++/14/bits/basic_string.h:2758:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(_CharT, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]' (near match)
 2758 |       find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT;
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:2758:7: note:   conversion of argument 2 would be ill-formed:
a.cc:12:32: error: invalid conversion from 'const char*' to 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-fpermissive]
   12 |                 pos=a.find(pos,"A");
      |                                ^~~
      |                                |
      |                                const char*
/usr/include/c++/14/bits/basic_string.h:2720:9: note: candidate: 'template<class _Tp> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::_If_sv<_Tp, typename __gnu_cxx::__alloc_traits<typename __gnu_cxx::__alloc_traits<_Alloc>::rebind<_CharT>::other>::size_type> std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _Tp&, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>]'
 2720 |         find(const _Tp& __svt, size_type __pos = 0) const
      |         ^~~~
/usr/include/c++/14/bits/basic_string.h:2720:9: note:   template argument deduction/substitution failed:
a.cc:12:32: note:   cannot convert '"A"' (type 'const char [2]') to type 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'}
   12 |                 pos=a.find(pos,"A");
      |                                ^~~
/usr/include/c++/14/bits/basic_string.h:2691:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const _CharT*, size_type, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2691 |       find(const _CharT* __s, size_type __pos, size_type __n) const
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:2691:7: note:   candidate expects 3 arguments, 2 provided
/usr/include/c++/14/bits/basic_string.h:2706:7: note: candidate: 'std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::size_type std::__cxx11::basic_string<_CharT, _Traits, _Alloc>::find(const std::__cxx11::basic_string<_CharT, _Traits, _Alloc>&, size_type) const [with _CharT = char; _Traits = std::char_traits<char>; _Alloc = std::allocator<char>; size_type = long unsigned int]'
 2706 |       find(const basic_string& __str, size_type __pos = 0) const
      |       ^~~~
/usr/include/c++/14/bits/basic_string.h:2706:32: note:   no known conversion for argument 1 from 'int' to 'const std::__cxx11::basic_string<char>&'
 2706 |       find(const basic_string& __str, size_type __pos = 0) const
      |            ~~~~~~~~~~~~~~~~~~~~^~~~~
a.cc:18:28: error: ISO C++ forbids comparison between pointer and integer [-fpermissive]
   18 |                 if(a[pos+1]=="C")