#include <stdio.h>
#include <stdlib.h>
 
int myStrlen(char s[]){
    int i;
    for(i = 0; s[i] != '\0'; i++);
    return i;
}
 
// 回文を作成する関数
char *setPalindrome(char s[]) {
    int len = myStrlen(s);
    int total_len = 2 * len;
    char *tmp = (char *)malloc((total_len + 1) * sizeof(char)); // 終端文字分のメモリを確保
 
    if (tmp == NULL) {
        fprintf(stderr, "Memory allocation failed\n");
        return NULL;
    }
 
    // 文字列を結合して回文を作成する
    for (int i = 0; i < len; i++) {
        tmp[i] = s[i];               // 元の文字列をコピー
        tmp[total_len - 1 - i] = s[i]; // 逆順にコピー
    }
    tmp[total_len] = '\0'; // 終端文字
 
    return tmp;
}
 
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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