Shutdown procedure after 60

Please enter “ I am a pig ” Cancel shutdown , otherwise 60 Turn off automatically in seconds .

#define _CRT_SECURE_NO_WARNINGS 1
#include <stdio.h>
#include <stdlib.h>
#include <string.h>


int main()
{
    
	char input[20] = {
     0 };
	system("shutdown - s - t 60");  //60s Power off after 
	again:
	printf(" Please enter that I am a pig , Otherwise shut down \n->");
	scanf("%s", input);
	if (strcmp(input, " I am a pig ") == 0)
		system("shutdown - a");  // Cancel shutdown 
	else
		goto again;
	return 0;
}