#include <stdio.h>

double fabs(double x) {
  
	if (x < 0)
	  return ((-1) * x);
	
	return x;  
}


int main(){
		
	printf("ABS %f.\n", fabs(-34.00));
	printf("ABS %f.\n", fabs(34.00));

	
	return 0;
}