#include <iostream>
#include <cstring>
using namespace std;

int main(void){
	string s; cin >> s;
	int size = s.size();
	string ans;
	for (int i = 0; i < size; ++i){
		int now = s[i] - 'A';
		now -= i + 1;
		if(now == 0) cout << 'A';
		else if(now == 1) cout << 'B';
		else if(now == 2) cout << 'C';
		else if(now == 3) cout << 'D';
		else if(now == 4) cout << 'E';
		else if(now == 5) cout << 'F';
		else if(now == 6) cout << 'G';
		else if(now == 7) cout << 'H';
		else if(now == 8) cout << 'I';
		else if(now == 9) cout << 'J';
		else if(now == 10) cout << 'K';
		else if(now == 11) cout << 'L';
		else if(now == 12) cout << 'M';
		else if(now == 13) cout << 'N';
		else if(now == 14) cout << 'O';
		else if(now == 15) cout << 'P';
		else if(now == 16) cout << 'Q';
		else if(now == 17) cout << 'R';
		else if(now == 18) cout << 'S';
		else if(now == 19) cout << 'T';
		else if(now == 20) cout << 'U';
		else if(now == 21) cout << 'V';
		else if(now == 22) cout << 'W';
		else if(now == 23) cout << 'X';
		else if(now == 24) cout << 'Y';
		else if(now < 0) cout << 'Z';
	}
	cout << ans << endl;
	return 0;
}