#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]){
    int i;
    for(i=0; s[i]!='\0'; i++);
    return i;
}
 
// 回文を生成する関数
char *setPalindrome(char s[]){
    int len = myStrlen(s);
    // 回文を格納するためのメモリを確保
    char *tmp = (char*)malloc(sizeof(char) * (len * 2 + 1));
 
    /*if (tmp == NULL) {  // メモリ確保が失敗した場合
        printf("Memory allocation failed.\n");
        return NULL;
    }*/
 
    // 元の文字列をtmpにコピー
    for (int i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
    // 反転した文字列をtmpの後ろに追加
    for (int i = 0; i < len; i++) {
        tmp[len + i] = s[len - 1 - i];
    }
 
    tmp[len * 2] = '\0'; // 文字列の終端を追加
 
    return tmp;
}
 
int main(){
    int i;
    char nyuryoku[1024]; // 入力用文字列
    char *kaibun;   // 回文を受け取るポインタ
    scanf("%s", nyuryoku);
    kaibun = setPalindrome(nyuryoku);
    printf("%s\n  -> %s\n", nyuryoku, kaibun);
    free(kaibun); // メモリの解放
    return 0;
}
 

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