#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[])
{
    int i;
    for (i = 0; s[i] != '\0'; i++)
        ;
    return i;
}
 
// 関数の中でtmpに対してmallocして
// そこに回文を代入してreturnで返しましょう
char *setPalindrome(char s[])
{ /*s=入力した文字列*/
    char *tmp;
    // 以下に必要な宣言を含めて書いてください
    int i;
    int len = myStrlen(s);
    tmp = malloc(sizeof(char) * (len * 2 + 1)); // 2倍のサイズでメモリを確保
    if (tmp == NULL)
    {
        printf("メモリの確保に失敗しました\n");
        return 0;
    }
 
    int y = len; // 末尾の位置を設定
    for (i = 0; i < len; i++)
    {
        tmp[i] = s[i];
    }
    for (int x = y - 1; x >= 0; x--)
        tmp[i++] = s[x];
    tmp[i] = '\0'; // 文字列の終端を設定
 
    return tmp;
}
 
// メイン関数はいじる必要はありません
int main()
{
    int i;
    char nyuryoku[1024]; // 入力
    char *kaibun;        // 回文を受け取る
    scanf("%s", nyuryoku);
    kaibun = setPalindrome(nyuryoku);
    printf("%s\n  -> %s\n", nyuryoku, kaibun);
    free(kaibun);
    return 0;
}

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