#define _USE_MATH_DEFINES
#include <bits/stdc++.h>
using namespace std;

#define rep(i, n) REP(i, 0, n)
#define ALL(v) v.begin(), v.end()
#define MSG(a) cout << #a << " " << a << endl;
#define REP(i, x, n) for (int i = x; i < n; i++)
#define OP(m) cout << m << endl
typedef long long ll;
typedef unsigned long long ull;

int main()
{
    int n;
    cin >> n;
    rep(i, n)
    {
        vector<char> a(8);
        rep(i, 8) cin >> a[i];

        sort(ALL(a));
        string minv = "";
        rep(i, 8) minv += a[i];

        sort(ALL(a), greater<char>());
        string maxv = "";
        rep(i, 8) maxv += a[i];

        OP(stoi(maxv) - stoi(minv));
    }

    return 0;
}
