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

fun main(args: Array<String>) {
	val S = readLine()?.toMutableList() ?: return

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