#define _crt_secure_no_warnings 1
 
#include <stdio.h>
#include <stdlib.h>
//課題２
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[]) {
    char* tmp;
    //以下に必要な宣言を含めて書いてください
    int len = mystrlen(s);
    int i, j;
    int left, right;
    for (i = 0; i < len; i++)
    {
        left = i;
        right = len - 1;
        while (left < right) {
            if (s[left] != s[right])break;
            left++;
            right--;
        }
    }
    int addlen = i;
    tmp = (char*)malloc(sizeof(char) * (len+addlen+1));
    if (tmp == NULL)
    {
        printf("error\n");
        return 0;
    }
 
    for (j = 0; j < len; j++)
    {
        tmp[j] = s[j];
    }
    for (j = 0; j < addlen; j++)
    {
        tmp[len + j] = s[len - 1 - j];
 
    }
    tmp[len + addlen] = '\0';
    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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