#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[]) {
    int len = myStrlen(s);
    int i;
 
    // mallocで2倍の長さ + '\0' の分を確保
    char *tmp = (char *)malloc((2 * len + 1) * sizeof(char));
    if (tmp == NULL) {
        // mallocに失敗した場合
        return NULL;
    }
 
    // 元の文字列をコピー（前半）
    for (i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
    // 逆順にしてコピー（後半）
    for (i = 0; i < len; i++) {
        tmp[len + i] = s[len - 1 - i];
    }
 
    // null終端
    tmp[2 * len] = '\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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