val dic = ('A'..'Z').toList()
val n = dic.size

fun main(args: Array<String>) {
	val S = readLine() ?: return
	var ans = ""

	S.forEachIndexed { i, v ->
		ans += dic[((v - 'A' - i - 1) % n + n) % n]
	}
	println(ans)
}