Scanf.scanf "%d" (fun t ->
    for i = 1 to t do
        Scanf.scanf " %d" (fun n ->
            let ns = string_of_int n in
            let m = 
                if ns.[0] = '9' then n * 2 else
                    let ss = int_of_string @@ String.init (String.length ns) (fun i -> '9') in
                    ss - n
            in
            Printf.printf "%d\n" m
        )
    done
)