Hashmat The Brave Warrior

#include<stdio.h>

int main() {
    unsigned long int a, b;
    while(scanf("%lu %lu", &a, &b)==2) {
        if (a > b){
            printf("%lu\n", a - b);           
        }
        else {
            printf("%lu\n", b - a);
        }
    }
    return 0;
}