#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
char *setPalindrome(const char *s) {
    int len = strlen(s);
    char *result = (char *)malloc(2 * len + 1); // 回文用のメモリ確保
    if (!result) return NULL;
 
    // 元の文字列をコピー
    strcpy(result, s);
 
    // 逆順に文字を追加
    for (int i = 0; i < len; i++) {
        result[len + i] = s[len - i - 1];
    }
    result[2 * len] = '\0'; // 終端文字を追加
 
    return result;
}
 
int main() {
    char input[100];
    scanf("%s", input);
 
    char *palindrome = setPalindrome(input);
    if (palindrome) {
        printf("%s\n", palindrome);
        free(palindrome); // メモリの解放
    }
 
    return 0;
}
 
 

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