//en C:#include<stdio.h>int main() { long p,q,r; while (scanf("%ld %ld",&p,&q)!=EOF) { if (q>p) r=q-p; else r=p-q; printf("%ld\n",r);}getchar();return 0;}
(( 1 / 0 )) &> /dev/null || { echo -e "stderrrrrrrrrrrrrrrrrrr";}