#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 size = myStrlen(s);
 
	tmp = (char*)malloc(sizeof(char)*(size * 2));
 
	for(i=0;i<size;i++){ //	tmpにsの文を入れる
		tmp[i] = s[i];
	}
 
	for(j=0;j<size-1;j++){
		for(k=0;k<size-1+j;k++){
			if(tmp[k] != tmp[size-1 + j-k]) //回文の判定
				break;
		}
		if(k>=size-1+j){ //回文であれば終了、回文でなければ続行
			tmp[size+j] = '\0';
			return tmp;
		}
		tmp[size+j] = s[size-j-2]; //sの後ろから２番目の値から代入
	}
}
 
 
//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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