Run id: 123254

Main.cc:18:19: warning: multi-character character constant [-Wmultichar]
             cout<<'no'<::length, std::allocator >' from type 'std::__cxx11::basic_string::size_type (std::__cxx11::basic_string::)() const noexcept {aka long unsigned int (std::__cxx11::basic_string::)() const noexcept}' to type 'int'
     int a1=a.length;
              ^
Main.cc:16:8: error: 'cher' was not declared in this scope
        cher b=a[i];
        ^
Main.cc:17:14: error: 'b' was not declared in this scope
         if(!(b<='9'&&b>='0')||(b<='Z'&&b>='A')||(b<='z'&&b>='a')||(b=='_')){
              ^