#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;
 
    int i,size;
    size = myStrlen(s);
    tmp = (char *)malloc(sizeof(char)*(2*size+1));
    if(tmp == NULL){
        printf("ERROR\n");
        return NULL; //void型なので何も返さず終了
    }
    for(i=0;i<size;i++) tmp[i] = s[i];
    for(i=0;i<size;i++) tmp[i+size] = s[size-i-1];
    tmp[2*size] = '\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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