View Compilation Error

0_0_39378929_31807.cpp: In function 'int main()':
0_0_39378929_31807.cpp:28:55: error: unable to find string literal operator 'operator""endl' with 'const char [7]', 'long long unsigned int' arguments
   28 |                 if(c) cout<<"NOT A VALID WORD"<<endl<<"******"endl;
      |                                                       ^~~~~~~~~~~~