How do I get this code to output "no input found" if nothing is inputted by the user. (if they just press enter first)

#include"stdio.h"

#include"string.h"

int main(){

char input[30];

while(1){

printf("input text : ");

scanf("%s",input);

if(strcmp(input,"Hello")==0)

{

printf("specific message");

break;

}

}

printf(" Good Bye! ");

return(0);

}