#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[]) {
    char *tmp;
    // 以下に必要な宣言を含めて書いてください
    int len = myStrlen(s);
    int i, j;
 
    // 回文の長さ = 元の長さ + (元の長さ - 1) = 2*len - 1
    // +1 は終端文字 '\0' の分
    tmp = (char *)malloc(sizeof(char) * (2 * len));  // 2*len で十分（最後の+1を含む）
 
    // 前半：元の文字列をそのままコピー
    for (i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
    // 後半：元の文字列の逆順（末尾から2文字目まで → 先頭へ）
    // 例: "abc" → "c" "b" の順に追加？ いいえ、"ba" の順
    // つまり s[len-2] から s[0] までを追加
    for (j = 0; j < len - 1; j++) {
        tmp[len + j] = s[len - 2 - j];
    }
 
    // 終端文字
    tmp[2 * len - 1] = '\0';
 
    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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