import java.util.*
import kotlin.math.*

fun str() = readLine()!!
fun int() = str().toInt()
fun long() = str().toLong()

fun read(d: String = " ") = str().split(d)
fun <T> list(d: String = " ", f: String.() -> T) = read(d).map { f(it) }
fun list() = list { toInt() }

fun <T> MutableList<T>.removeLast() = this.removeAt(this.lastIndex)

const val mod = 1000000007L

fun main() {
    abc000X()
}

fun abc000X() {
    val s = str()
    println(s + if (s.endsWith("s"))
        "es" else "s")
}
