open System
type Sol() =
    member this.Solve() = 
        let ss = stdin.ReadLine() + stdin.ReadLine();
        let mutable cnt = 0
        let mutable max = 0
        let N = Seq.length ss
        for i = 0 to (N-1) do
            if ss.[i] = 'o' then (
                cnt <- cnt + 1;
                max <- if cnt > max then cnt else max
            ) else (
                cnt <- 0
            )
        printfn "%d" max
        
let mySol = new Sol()
mySol.Solve()