#include <stdio.h>
#include <stdlib.h>
#include <string.h>
 
char *setPalindrome(char s[]){
    int length = strlen(s); //文字列の長さの取得
    char *pal = (char*)malloc(sizeof(char) * (2 * length));
 
    if(pal == NULL)return NULL;
 
    strcpy(pal, s); //文字列のコピー(s -> pal)
 
    for(int i=0; i < length - 1; i++){
        *(pal + length + i) = s[length - 2 - i];
    }
    *(pal + 2 * length - 1) = '\0';
 
    return pal;
}
int main(void){
    char enter[1024];
    scanf("%s", enter);
    char *result = setPalindrome(enter);
    printf("%s", result);
    free(result);
    return 0;
}

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