#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 i,j,k;
    int len = myStrlen(s);
 
    tmp = (char *)malloc(sizeof(char)*len*2+1);
    if(tmp == NULL){
        printf("ERROR\n");
        return 0;
    }
 
    for (i = 0; i < len; i++) {
        tmp[i] = s[i];
    }
 
 
    for (j = len, k = len - 1; k >= 0; j++, k--) {
        tmp[j] = s[k];
    }//for関数はこのような表記体系で2変数同時に操作できる。
 
    tmp[myStrlen(s) * 2] = '\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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