#include <stdio.h>
#include <string.h>
 
void reverse(const char string[], char out[]) {
    int i = 0;
    int j = strlen(string);
    out[strlen(string)] = '\0';
 
    while (j != 0) {
        out[i] = string[j - 1];
        i++;
        j--;
    }
}
 
// Rozmiar maksymalnej linijki.
#define BUFFER_SIZE 2048
 
int main(void) {
    char input[BUFFER_SIZE];
    char output[BUFFER_SIZE];
    fgets(input, BUFFER_SIZE, stdin);
    reverse(input, output);
    puts(output);
    return 0;
}

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Godzio ma pralke.