#include <stdio.h>
#include <string.h>
#include <ctype.h>
int main () { 
    char s[101];
    fgets(s, size(s), stdin);
    s[strcpn(s,"/n")= '\0';
    int len = strlen(s);
    for (int i = 0; i < len; i++) {
        if (!(isalpha(s[i]) || s[i] = '')) {
            printf("Invalid input");
            return 0;
        }
    }
    int start = 0;
    for (int i = 0; i <= len; i++) {
        if (s[i]== '') || s[i] = '\0') {
            int end = i - 1;
            while(start<end) {
                char temp = s[start];
                s[end] = temp;
                start ++;
                end--;
            }
            start = i+1;
        }
    }
            printf("%s", s);
            return 0;
}