#include <stdio.h>
#include <stdlib.h>
 
// 文字列の長さを求める関数
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[]){
    char *tmp;
    int i, len;
    len = myStrlen(s);
 
    // 回文の長さは元の文字列の長さ * 2 - 1 (中間の文字は重複)
    tmp = (char *)malloc((2 * len) * sizeof(char)); // メモリ確保
 
    // 元の文字列をコピー
    for (i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
    // 逆順の文字列を追加（末尾から逆順に追加）
    for (i = 0; i < len; i++) {
        tmp[len + i] = s[len - i - 1];
    }
 
    tmp[2 * len] = '\0';  // 終端文字を追加
 
    return tmp;
}
 
int main(){
    int i;
    char nyuryoku[1024]; 
    char *kaibun;   
 
    // 入力を受け取る
    scanf("%s", nyuryoku);
 
    // 回文を生成
    kaibun = setPalindrome(nyuryoku);
 
    // 結果を出力
    printf("%s\n  -> %s\n", nyuryoku, kaibun);
 
    // 動的メモリの解放
    free(kaibun);
 
    return 0;
}
 

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