let solve str =
  let lstr = String.length str in
  let rec solve' idx curSum maxSum =
    let nextMaxSum = if curSum > maxSum then curSum else maxSum in
    if idx >= lstr then nextMaxSum
    else
      let nextCurSum = if str.[idx] = 'o' then (curSum + 1) else 0 in
      solve' (idx + 1) nextCurSum nextMaxSum
  in
  solve' 0 0 0

let () =
  let s1 = read_line ()
  and s2 = read_line ()
  in
  solve (s1 ^ s2) |> string_of_int |> print_endline