var Main = function (input) {
	var elements = input.split("");
	var ary1 = elements.map(function(item, i){
		var num = elements[i].charCodeAt(0);
		num = (((num - 65) - (i + 1) + 25) % 25) +65
		return String.fromCharCode(num);
	});
	console.log(ary1.join(''))
};

//Don't Edit this code
Main(require("fs").readFileSync("/dev/stdin", "utf8"));