#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 i, len = myStrlen(s);
 
	// 元の文字列の2倍の長さ + 終端文字('\0')分のメモリを確保
	tmp = (char *)malloc(sizeof(char) * (len * 2 + 1));
 
	for (i = 0; i < len; i++) {
		tmp[i] = s[i];            // 前半部分にコピー
		tmp[2 * len - 1 - i] = s[i]; // 後半部分に逆順でコピー
	}
 
	tmp[2 * len] = '\0'; // 終端文字を代入
	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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