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

int main() {
    char * name = calloc(1, sizeof(char)), c;
    int strLen = 0;

    while(scanf("%c", &c) == 1 && c != '\n') {
        name[++strLen] = c;
        name = realloc(name, (strLen + 1) * sizeof(char));
    }

    for(char * rear = &name[strLen]; *rear;  rear--) {
        printf("%c", *rear);
    }
    puts("");
}