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

void envers(const char texte[]) {
	int position; //Ligne à changer
	for(position = strlen(texte)-1; position >= 0; position--) {
	    printf("%c", texte[position]);
	}
	printf("\n");
}

int main(int argc, char * argv[]) {
  	if (argc < 2) {
   	 	printf("usage : %s <texte>\n", argv[0]);
   	 	return EXIT_FAILURE;
  	}
  	envers(argv[1]);
  	return EXIT_SUCCESS;
}