#include <stdio.h>
#include <stdlib.h>
 
 
// 関数の中でtmpに対してmallocして
int myStrlen(char s[]){
    int i;
    for(i=0;s[i]!='\0';i++);
    return i;
}
// そこに回文を代入してreturnで返しましょう
char *setPalindrome(char s[]){
	  char *tmp;
    int i, size;
    size = myStrlen(s);
    tmp = (char *)malloc(sizeof(char) * (2 * size + 1));
    if(tmp == NULL) {
        printf("ERROR\n");
        return NULL;
    }
    // 元の文字列をコピー
    for(i = 0; i < size; i++) {
        tmp[i] = s[i];
    }
    // 順番を逆にして後ろにコピー
    for(i = 0; i < size; i++) {
        tmp[i + size] = s[size - i - 1];
    }
    // 終端文字
    tmp[2 * size] = '\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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