let charTable = "abcdefghijklmnopqrstuvwxyz".uppercased().map{$0}

var caseDic = [Character:Int]()

for i in 0..<charTable.count {
    caseDic[charTable[i]] = i
}

let inpt = readLine()!.map{$0}

var ans = ""

for i in 0..<inpt.count {
    var idx = caseDic[inpt[i]]! - (i+1)
    while idx < 0 {
        idx += charTable.count
    }
    ans += String(charTable[idx])
}

print(ans)