#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]){//文字列の長さを返す関数
    int i,count=0;
    for(i=0;s[i]!='\0';i++){
        count++;
    };
    return count;
}
 
// 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 howlong = myStrlen(s);//元の文字数
	int alllong = howlong*2;//元の文字列の2倍
 
	tmp=(char *)malloc(sizeof(char)*(howlong+1));//終端文字があるため+1
	//エラー処理
	if(tmp == NULL){
	    printf("ERROR\n");
	    return 0;
	}
 
	// 元の文字列をコピー
    for (int i = 0; i < howlong; i++) {
        tmp[i] = s[i];
    }
 
    // 逆順にコピーして回文を作る
    for (int i = 0; i < howlong; i++) {
        tmp[howlong + i] = s[howlong - 1 - i];
    }
 
    tmp[alllong] = '\0'; // 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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