#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 nyuryoku_len=myStrlen(s);
    //printf("nyuryoku_len=%d\n", nyuryoku_len);
 
    tmp=(char *)malloc(sizeof(char)*((nyuryoku_len*2)));
 
    for(int i=0;
    i<nyuryoku_len;
    i++){
        tmp[i]=s[i];
    }
 
    for(int j=0;
    j<nyuryoku_len;
    j++){
        if(s[nyuryoku_len-(j+2)]){
            tmp[j+nyuryoku_len]=s[nyuryoku_len-(j+2)];
        }else{
            tmp[j+nyuryoku_len]='\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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