#include <stdio.h>
#pragma GCC optimize("Ofast,inline")

//将字符串str中的内容反向打印的函数
void reversePrint(char str[]);

int main() {
  char s[100];

  scanf("%s", s);
  reversePrint(s);
  printf("\n");

  return 0;
}

/* 请在这里填写答案 */
#include <stdlib.h>
#include <string.h>
void reversePrint(char str[]) {
  if (str == NULL) {
    return;
  }
  if (strlen(str) == 1) {
    printf("%c", str[0]);
  } else {
    char *tmp = malloc(sizeof(char) * strlen(str));
    /* Why this:
     * char *tmp = malloc(sizeof(char) * (strlen(str) - 1));
     * doesn't work? */
    for (int i = 1, n = strlen(str), j = 0; i < n; i++, j++) {
      tmp[j] = str[i];
    }
    reversePrint(tmp);
    free(tmp);
    printf("%c", str[0]);
  }
}