#nullable enable

#region
var (_input, _iter) = (Array.Empty<string>(), 0);
T I<T>() where T : IParsable<T>
{
    while (_iter >= _input.Length) (_input, _iter) = (Console.ReadLine()!.Trim().Split(' '), 0);
    return T.Parse(_input[_iter++], null);
}
#endregion

var f = new Dictionary<(long, int), long>();
for (var i = 0; i <= 9; i++) f[(0, i)] = i;
long F(long x, int d)
{
    var key = (x, d);
    if (f.TryGetValue(key, out var cv)) return cv;
    var res = 0L;
    for (var i = 0; i <= Math.Min(x, 9); i++) res += F((x - i) / 10, Math.Max(d, i));
    return f[key] = res;
}

var ans = new List<long>();
var t = I<int>();
for (var i = 0; i < t; i++)
{
    var l = I<long>();
    var r = I<long>();
    ans.Add(F(r, 0) - F(l - 1, 0));
}
Console.WriteLine(string.Join(Environment.NewLine, ans));