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