#include<bits/stdc++.h> using namespace std; int main(){ string a; cin >> a; char t; int al = a.size(); for (int i =0;i < al;i++){ if(t >= 'a' && t<= 'z'){ s[i] = s[i]-32; }else{ s[i] = s[i]+32; } t = a[i]; t = a[i]-i; t = t - 3; cout << t; } return 0; }