Help me in solving SYNN2 problem

My issue

My code

#include <stdio.h>

int main() {
  printf("%d",Hey);
  return 0;
}

Learning course: Learn C
Problem Link: CodeChef: Practical coding for everyone

%d is called a format specifier. We format specifier only to print variables. “Hey” is not a variable. It is just a string. And %d is used to print integer variables. If you want to print any string message you can directly print it using “string”.
So the correct line would be printf("Hey");