#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]) {
    int i;
    for (i = 0; s[i] != '\0'; i++);
    return i;
}
 
// 回文を作成する関数
char *setPalindrome(char s[]) {
    int len = myStrlen(s);
    int i, j;
    char *tmp;
 
    // メモリ確保: オリジナル文字列 + 逆順文字列 + null 終端
    tmp = (char*)malloc(sizeof(char) * (2 * len + 1));
 
    // オリジナル文字列をtmpにコピー
    for (i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
    // 逆順文字列をtmpにコピー
    for (j = 0; j < len; j++) {
        tmp[len + j] = s[len - j - 1];  // 正しく逆順にコピー
    }
 
    // null 終端を追加
    tmp[2 * len] = '\0';
 
    return tmp;
}
 
// メイン関数は変更不要
int main() {
    char nyuryoku[1024];  // 入力用の配列
    char *kaibun;         // 回文を受け取るポインタ
 
    scanf("%s", nyuryoku);  // 文字列の入力
    kaibun = setPalindrome(nyuryoku);  // 回文を生成
 
    printf("%s\n  -> %s\n", nyuryoku, kaibun);  // 結果を表示
 
    free(kaibun);  // 確保したメモリを解放
    return 0;
}
 

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