#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;
	int slen=myStrlen(s);
 
	//以下に必要な宣言を含めて書いてください
	tmp=(char *)malloc(sizeof(char)*(2*slen-1));
	if(tmp==NULL){
		printf("error"); return NULL;
	}
 
	for(int i=0; i<slen;i++ ){
		tmp[i]=s[i];
	}
 
	int k=1;
	for(int i=slen; i<=slen*2-1; i++){
		if(i==slen*2-1){
			tmp[i]='\0';
		}
		else{
			tmp[i]=s[slen-2*k];
			k++;
 
		}
	}
	//０１２３ ４５６７
	//０１２３ ２１０￥
	// ０１２３４　５６７８９
	// ０１２３４　３２１０￥
 
 
	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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