#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 n=myStrlen(s);
	int j=0;
	char* s_trans;
	s_trans=(char*)malloc(sizeof(char)*(n+1));
	for(int i=n-1;i>=0;i--){
		s_trans[j]=s[i];
		j++;
	}
	s_trans[j]='\0';
 
	tmp=(char*)malloc(sizeof(char)*(2*n+1));
	for(int i=0;s[i]!='\0';i++){
		tmp[i]=s[i];
	}
	for(int i=0;s_trans[i]!='\0';i++){
		tmp[n+i]=s_trans[i];
	}
	tmp[2*n]='\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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