#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 len = myStrlen(s);
 
    // 回文は「元の文字列 + 逆順文字列」で作る
    char *tmp = malloc((2 * len + 1) * sizeof(char));
 
    // 前半：元の文字列をコピー
    for(int i = 0; i < len; i++){
        tmp[i] = s[i];
    }
 
    // 後半：逆順にコピー
    for(int i = 0; i < len; i++){
        tmp[len + i] = s[len - 1 - i];
    }
 
    tmp[2 * len] = '\0';  // 終端
 
    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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