fun main(args: Array<String>) {
    val inText = readLine()!!
    val arr = inText.map { it }.toMutableList()
    for(i in arr.indices) {
        var newChar = arr[i] - (i+1)
        if(newChar < 'A') {
            newChar = 'Z' - ('A' - newChar - 1)
        }
        arr[i] = newChar
    }
    println(arr.joinToString(""))
}