open System
open System.Collections.Generic

[<AutoOpen>]
module Cin =
    let read f = stdin.ReadLine() |> f
    let reada f = stdin.ReadLine().Split() |> Array.map f
    let readChars() = read string |> Seq.toArray
    let readInts() = readChars() |> Array.map (fun x -> Convert.ToInt32(x.ToString()))

[<AutoOpen>]
module Cout =
    let writer = new IO.StreamWriter(new IO.BufferedStream(Console.OpenStandardOutput()))
    let print (s: string) = writer.Write s
    let println (s: string) = writer.WriteLine s
    let inline puts (s: ^a) = string s |> println

let solve() =
    let s = read string |> fun x -> x.Split(':')
    let h = Convert.ToInt32(s.[0]) * 60
    let m = Convert.ToInt32(s.[1])

    let hm = (h + m + 5) % (24 * 60)
    let h = hm / 60
    let m = hm % 60
    let h = h.ToString("D2")
    let m = m.ToString("D2")
    sprintf "%s:%s" h m |> puts
    ()

[<EntryPoint>]
let main _ =
    try
        solve()
    with e -> printfn "%s" (e.ToString())
    writer.Close()
    0 // return an integer exit code