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