let lcs x y =
  let m = String.length x in
  let n = String.length y in
  let dp = Array.make_matrix (m+1) (n+1) 0 in
  let rec duduwa i j =
    if j > n then doit (i + 1)
    else begin
      dp.(i).(j) <- if x.[i-1] = y.[j-1] then dp.(i-1).(j-1) + 1 else max dp.(i - 1).(j) dp.(i).(j-1);
      duduwa i (j + 1)
    end
  and doit i =
    if i > m then dp.(m).(n)
    else duduwa i 1
  in
  doit 1

let () =
  let q = read_int () in
  let rec doit i =
    if i < q then begin
      let x = read_line () in
      let y = read_line () in
      Printf.printf "%d\n" (lcs x y);
      doit (i + 1)
    end
  in
  doit 0