let a = "ABCDEFGHIJKLMNOPQRSTUVWXYZ".map{String($0)}
let s = readLine()!.map({String($0)})
var ans=[String]()
for i in 0..<s.count {
    var z=0
    for j in 0..<26 {
        if a[j]==s[i] {
            z=j
            break
        }
    }
    while z-i-1<0 {z+=26}
    print(a[z-i-1],terminator: "")
}
print("")