/*
User ID: turing_13
Link: https://uva.onlinejudge.org/index.php?option=com_onlinejudge&Itemid=8&category=12&page=show_problem&problem=996
*/

#include <stdio.h>

int main()
{
	long long a,b,c;
	while(scanf("%lld %lld",&a,&b)!=EOF)
	{
	    c=a-b;
	    if(c<0)
            c*=-1;
		printf("%lld\n",c);
	}
	return 0;
}