#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[]){
	char *tmp;
	//以下に必要な宣言を含めて書いてください
	int m = myStrlen(s);
    tmp = (char *)malloc(sizeof(char)* (2*m+1));
       if (tmp == NULL) {
        printf("ERROR\n");
        return 0;}
    for (int i = 0; i < m; i++) {
        tmp[i] = s[i];}
    if (m/2==0){
    for (int i = 0; i < m; i++) {
        tmp[m+i] = s[m-1-i];}
    tmp[2 * m]='\0';
}
    else{
    for (int i = 0; i < m; i++) {
        tmp[m+i-1] = s[m-1-i];}
    tmp[2 * m]='\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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