import java.util.Scanner;
public class Main {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
String str = sc.nextLine();
char[] arr = str.toCharArray();
for(int start = 0,end = arr.length -1;start <= end;start ++,end --){ //字符串倒序
char temp = arr[start];
arr[start] = arr[end];
arr[end] = temp;
}
String strNew = String.copyValueOf(arr);//数组转字符串
String strAll = str+strNew;//字符串拼接
System.out.print(strAll);
}
}
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