#include <stdio.h>


int main(void) {
    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);
    }

    return 0;
}