interface Converter {
	void encode();
	void decode();
}

class U_SA_ implements Converter {
	private final int firstNum = 65;
	private final int lastNum = 90;
	private char[] code;

	public U_SA_(String s) {
		this.code = s.toCharArray();
	}

	public void encode() {

	}

	public void decode() {
		int num;
		for (int i = 0; i < code.length; i++) {
			num = (i + 1) % 26;
			code[i] = decode2(code[i], num);
		}
	}

	public char decode2(char c, int num) {
		if ((c - num) >= firstNum) {
			c -= num;
			return c;
		} else {
			c = (char) (lastNum - (firstNum - (c - num)) + 1);
			return c;
		}
	}

	public void printCode() {
		System.out.println(this.code);
	}
}

public class No_18 {

	public static void main(String[] args) {
		java.util.Scanner sc = new java.util.Scanner(System.in);

		U_SA_ u_sa_ = new U_SA_(sc.next());

		u_sa_.decode();

		u_sa_.printCode();
		
		sc.close();

	}

}