UVA 10055

#include <stdio.h>
int main() {
    long long int a,b;
    while ((scanf("%lld%lld",&a,&b) != EOF)) {
        if (a > b) {
            printf("%lld\n",a-b);
        }
        else {
            printf("%lld\n",b-a);
        }
    }
    return 0;
}