#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char *setPalindrome(char *s)
{
    int len = strlen(s);
    char *p;

    p = (char *)malloc(sizeof(char) * (len * 2 + 1));

    for (int i = 0; i < len; i++) {
        p[i] = s[i];
    }

    for (int i = 0; i < len; i++) {
        p[len + i] = s[len - 1 - i];
    }

    p[len * 2] = '\0';

    return p;
}

int main(void)
{
    char s[100];
    char *answer;

    scanf("%s", s);

    answer = setPalindrome(s);

    printf("%s\n", answer);

    free(answer);

    return 0;
}