open System
let R T = stdin.ReadLine()|> T
let RS T = stdin.ReadLine().Split()|>Array.map T
let Mod = (1e9|>int64)+7L
[<EntryPoint>]
let main argv =
    let S,T=RS string|>fun c -> c.[0],c.[1]
    stdout.Write T
    stdout.WriteLine S
    0
