#include <stdio.h>
#include <stdlib.h>
#include <string.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=myStrlen(s);
	char *x;
	x=(char*)malloc(i+1);
	tmp=(char*)malloc(i*2+1);
	if(tmp==NULL){
		printf("ERROR\n");
		return 0;
	}
 
	for(int k=0;k<i;k++)
		x[k]=s[i-k-1];
		x[i]='\0';
 
	strcpy(tmp, s);
    strcat(tmp, x);
 
    free(x);
 
	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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