#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;
	int len=myStrlen(s);//カウントした文字列sの文字数をlenに格納
	tmp=(char*)malloc(sizeof(char)*(len+1));//tmpの動的確保
	if(tmp==NULL){//エラー処理
		printf("ERROR");
		return 0;
	}
	for(i=0;i<len;i++){//前半はそのまま文字列をコピー
		tmp[i]=s[i];
	}
	for(i = 0; i < len; i++){//後半は文字列を逆転してコピー
        tmp[len + i] = s[len - 1 - i];
    }
    tmp[2 * len] = '\0';//2倍の長さになった文字列の最後に終端文字
	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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