// Author: btjanaka (Bryon Tjanaka)

// Problem: (UVa) 10055

#include <bits/stdc++.h>

#define FOR(i, a, b) for (int i = a; i < b; ++i)

#define FORe(i, a, b) for (int i = a; i <= b; ++i)

#define PAI(arr, len) /*Print array of integers*/ \

{ \

for (int _i = 0; _i < len; ++_i) { \

if (_i != len - 1) { \

printf("%d ", arr[_i]); \

} else { \

printf("%d", arr[_i]); \

} \

} \

putchar('\n'); \

}

#define PBS(n, len) /*Print a bitset*/ \

{ \

for (int _i = 0; _i < len; ++_i) { \

putchar(n % 2 + '0'); \

n /= 2; \

} \

putchar('\n'); \

}

#define GET(x) scanf("%d", &x)

#define PLN putchar('\n')

typedef long long ll;

using namespace std;

int main() {

ll x, y;

while (scanf("%lld %lld", &x, &y) > 0) {

printf("%lld\n", max(y - x, x - y));

}

return 0;

}