#include<stdio.h>
#include<math.h>
void main()
{
	float a,b,z;
	scanf("%f%f",&a,&b);
	if(a-b>=0)
		z=a-b;
		printf("z=%f\n",z);
	else if(a-b<0)
		z=-a+b;
	printf("z=%f\n,z");
}