gets.to_i.times do
  a, b, c = gets.split.map(&:to_i)
  min, max = [a, b, c].minmax

  result = if a == b && b == c
             if b <= 2
               1
             else
               3
             end
           elsif a == c
             if a <= 1
               -1
             else
               1
             end
           elsif b == min || b == max
             0
           elsif b <= 2
             -1
           else
             [min == 1 ? 0 : b - min + 1, max - b + 1].select(&:positive?).min
           end

  puts result
end