import std;
import core.bitop;
import core.checkedint;
import core.time;

const dx = [-1, 1, 0, 0];
const dy = [0, 0, -1, 1];

void main() {
	auto a = readln.chomp.split("").to!(int[]);
	a.sort;
	writeln(a[2] - a[0]);
}

pragma(inline)
string yes(const bool b) pure @nogc nothrow @safe {
	return b ? "Yes" : "No";
}

pragma(inline)
bool range(const int a, const int x, const int b) pure @nogc nothrow @safe {
	return a <= x && x < b;
}