// inputに入力データ全体が入る
function Main(input) {
	// 1行目がinput[0], 2行目がinput[1], …に入る
	input = input.split("\n");
	let str=input[0].split("");
	arr=["A","B","C","D","E","F","G","H","I","J","K","L","M","N","O","P","Q","R","S","T","U","V","W","X","Y","Z"];
	let ans="";
	
	for(let i=0;i<str.length;i++){
	    
	    for(let j=0;j<arr.length;j++){
	        if(str[i]==arr[j]){
	            let a=(j-(i+1))%26;
	            
	            if(a<0){
	                a+=26
	            }else{
	                
	            }
	            
	            
	            ans+=arr[a];
	        }else{
	            
	        }
	        
	        
	    }
	    
	}
	console.log(ans);
}
//*この行以降は編集しないでください（標準入出力から一度に読み込み、Mainを呼び出します）
Main(require("fs").readFileSync("/dev/stdin", "utf8"));